Alas, Poor Scrappy: Guests were often seen as a Scrappy Mechanic, annoying and inexperienced, and even as a foolproof way for trolls to exploit games and get away with it. However, when Guests were removed in October 2017 as a way to increase user count, many players felt Roblox was being greedy and started to mourn the Guests, with tributes such as The Last Guest.
Author's Saving Throw: The premium membership Builder's Club becoming Roblox Premium was well received for fixing several criticisms concerning BC; Robux is now given in full on a monthly basis rather than being drip fed to members daily, and all tiers share the same perks, including access to DevEXnote A feature that lets you exchange Robux for real money, something that was previously locked behind Outrageous Builder's Club, the highest BC tier.
For games themselves:
Airplane 2 was heavily criticized for it's massive Ass Pull regarding the fact that president Ronald was not the Monster, but the agent was the real monster. In response to this, Ponchokings added collectable notes, which when collected, provided a brief Jump Scare that also doubles as a Wham Shot which shows the Monster with the Agent's hat, which provided some actual foreshadowing to the Monster's disguise.
Iron Blades, it sounds like your token climatic battle theme in any respectable Eastern RPG (Actually, it is, it's actually the song Darkness Dueling from Chrono Symphonic, an OCRemix based on Chrono Trigger's battle theme).
"Radical Shift", used in the 2011 commercial, is an exciting mixture of electronic synths, especially at the breakdown
Freeze-Tag in Roblox Summer Tournament 2018, for its objective of simply winning a special round was a heck a lot easier than The Doom Wall's and Spawn Wars'.
Feed Your Pets is this for the Aquaman (2018) event. The objectives here are significantly easier than the hub game and the two other side games'note Bandit Simulator and Booga Booga, as they're both Fetch Quests for sapphires and pearls that happen to be abundant.
To this day, there are still people upset over the removal of the Tickets currency system and people telling them to get over it. Some say that the changing state of Roblox's economy caused Tickets to lose their value overtime and that it was fine to limit earning and spending to a single currency, while others regard it as the worst example of Roblox's Allegedly Free Game status.
The removal of copyrighted audio snapped the Roblox community in half. One half were happy that Roblox is free from potential legal trouble and they would no longer listen to annoying mainstream pop songs. The other half were sad that they could no longer hear their favorite songs and have to resort to a bland majority of the non-APM audio left.
Demonic Spiders: From the 2010 egg hunt, the Radioactive Egg of Undead Apochalypse constantly spawned zombies (until picked up) that were immune to most non-explosives, faster than the average player, and did fatal amounts of damage in a split-second, making visitors to places without weapons officially screwed.
Ear Worm: "Here We Go", the Roblox anthem: "I want it want it, and I gotta have it! Na na na na na na na! Oh... here we go!"
Fandom Rivalry: Most players during 07-08 suffered from the illusion that they were at a war with Blockland. Then it was Minecraft. However, it has mostly died out, though it still persists among people unfamiliar with ROBLOX.
Game-Breaker: Back in the second iteration of Sword Fight on the Heights, the Ice Dagger was this in spades. All you had to do was simply touch a player with it, and they would freeze for about a second before dying instantly. It was completely out of balance with the regular sword and the Firebrand, and the brief period of immobilization usually wasn't enough to get the holder of it finished off (since it's really easy to just move out of the way). When that version was still popular, there usually was an unspoken rule to simply not use the Ice Dagger since everyone generally agreed it made the game less fun. Thankfully, once SFOTH 3 came out, it was rebalanced so that it needed a warm-up first and that it couldn't affect people holding the Firebrand, reworking it into a more strategic weapon.
Germans Love David Hasselhoff: Starting in 2016, non-English-speaking players, who mostly spoke Spanish, crowded popular games. Roblox answered this by introducing localization tools in 2018.
Good Bad Bugs: Enemy humanoids and entities may spawn with only their heads and torso, and if they're carrying a weapon, it'll appear near them instead of them carrying it. This is especially useful in older RPG-style games since you can't get hurt if this happens, unless the torso and/or head is scripted to deal damage on contact.
This game made a huge deal out of hats a few years before it became the main joke about Team Fortress 2.
There was a case of the other way around too. At the end of 2014, Team Fortress 2 was going to have a new map but it was removed from the update it was going to be in due to Valve deeming the map "too confusing for new players". When tickets were phased out in ROBLOX, one of the reasons the blog said that they were being removed was because the staff considered them to be "confusing to first-time users". This quickly became Memetic Mutation and people have jokingly said that being "too confusing for new players" was the reason why certain things were removed or simplified since then.
Harsher in Hindsight: The Hazmat Isolation Helmet hat had a second sentence, which was "Someone's put Ebola in the water supply. That sentence has been removed since 2014.
The Aquaman (2018) event has also received his. Destroying even a level oneMecha-Mook in the main game was frustrating, even more frustrating with the lag. The objectives throughout the event are tedious and time-consuming, although Feed Your Pets' Fetch Quests managed to be quite easy. (Fortunately, the developers responded by giving XP boosts to those under-level and reducing the difficulty of the Trial of Strength.)
Outside of events, Rogue Lineage is heavily criticized by some for being extremely unfriendly towards newbies (to the point where even using in-game microtransactions to reincarnate into a stronger character will still get your butt kicked). Reading a guide is practically mandatory, and even then you'll be likely to lose all 3 lives within seconds.
It's the Same, Now It Sucks!: Obstacle courses are one of the worst offenders to this. All of them have things that have been used a million times before, such as balance beams, lava jumps (checkerboards are popular in this category), small platforms, invisible walkways, mazes, and quizzes.
Tycoons, simulators (with at least one exception depending on who you ask), and to a lesser extent Camping-inspired story games tend to get this reaction as well.
Obbies that involve escaping someplace usually result in this. If you're given a reason to escape, it's usually "the owner of the place has gone mad, you must escape!" Without any explanation as to how it happened.
Club Tesla, one of those nightclub games, suffered this when an underage ex-girlfriend of the creator, DjMykal, accused him of allegedly distributing nude photos of her. He and the game are still on Roblox, though Club Tesla currently suffers low concurrent player counts because of this.
Magnet Simulator, a game about collecting coins with magnets, was close to becoming one of the big name simulator games during the 2018 simulator craze when it was discovered that the map and other assets were blatantly stolen from another popular simulator named Bubble Gum Simulator. The game was bombarded with dislikes and the game's creator was criticized on Twitter until it ended with Roblox themselves Content Deleting the game. Afterwards, the developer apologised and revealed a newer, different map, but as KonekoKitten pointed out, the backlash may have tarnished the game's reputation forever.
Popularity Polynomial: Doomspire Brickbattle used to be a popular game in the early days of Roblox, but then people forgot about it and stopped playing it. In 2017, the game became popular again due to advertising and promotion.
"Menu Chat", also known as "Safe Chat", in the days when it existed. It took the form of a sort of Dialogue Tree-based chat function, and was almost totally useless for meaningful communication compared to the more conventional user-typed "Text Chat". Worse, if you were under 13, you were forced to use nothing but Menu Chat. Even the developers themselves admitted it was pretty stupid, and eventually removed it entirely.
The profanity filter that replaced it is also strongly disliked, though to a lesser degree. It's rather peculiar about what it censors; for instance, words like "twat" go straight through, yet often perfectly innocent words or even people's names get rendered into strings of pound signs or [Content Deleted]. In an amusing bit of meta-censorship, the word "censored" occasionally gets censored. As of February of 2017, the filter was strengthened and regular common day words such as "my", "I", "you", "a", "as", "or", and so on can be censored. The filter's also inconsistent about if it censors a certain word or not.
Song Association: Try to find anyone who doesn't think of Badliz's "The Great Strategy" as the Roblox theme song (it was the iconic music used in the original 2006 trailer, and a few more after). Just try. Even a remake of it posted on his official channel is filled with comments that are all Roblox-related. Not necessarily a bad thing, as it also gave him quite a bit of publicity.
"Stop Having Fun" Guys: There are players who have their own strict rules for how someone should make a game and discourage even minor usage of free models (such as free model scripts) or other features at a builder's disposal.
Any disater involving enemies with perfect aim in Survive the Disasters, an example being the aliens. You pretty much have to take cover or else you die. The worst of these are the Murderers and Sighters; the Sighters are invincible and will hit you if you are not behind cover for 10-15 damage, and the Murderers have fast, instant kill knifes that make any form of fighting back impossible.
The Teleggkinetic Egg floor in Egg Hunt 2019: Scrambled in Time is pretty nasty for the first Power Egg. Directing ships that are being flung towards you right into a target is hard enough since you're given little to no warning before they start flying at you, but then once you get around that the egg will start firing a laser at you every few seconds, and you have to hide behind objects to try and protect yourself from the attack, which is especially tricky during the already difficult wall running segment.
Levels 27 and 29 in Speed Run 4. Level 27 is a candy land of doom which requires very precise jumps, but due to some of the platforms being lollipops and ice cream cones, you could slip off of them easily due to their roundness. Level 29 will grind your gears (literally, as it has gears as decoration or platforms) with very small and thin platforms that you can fall off of easily.
Any dungeon that comes after Winter Outpost in Dungeon Quest is this. Being an already difficult game, By the time you reach level 60, Winter Outpost and Desert Temple had full difficulties available from Easy to Nightmare. Pirate Island and later dungeons, on the other hand, comes with only Insane and Nightmare available. On top of that, it is also the first dungeon in the game the player encounters that introduces mini-bosses that need to be defeated to progress, and new, often difficult-to-dodge patterns.
King's Castle takes it a little further by introducing an exclusive, unique type of enemy and an preemptive attack right before the dungeon's boss that covers all previous rooms in lava, potentially killing any players lagging behind the party and preventing healers from running to safety.
They Changed It, Now It Sucks!: Some players, notably older users, hate change. The pattern that seems to be repeating is that if someone stays with the game for a few years, they will consider the year they initially joined as their personal golden age, then complain about how "crap" the game is now. This isn't limited to one specific set of users either; 2007-08 users reject everything from 2010 onward, where users who joined between 2009 and 2012 consider those years the best ones while panning how bad it's gotten now. There doesn't seem to be an end to this cycle either. This has died down in recent times, as many people have realized through old ROBLOX simulators that old ROBLOX wasn't as good as it seemed at the time, along with newer ROBLOX updates increasing in quality around 2018.
Roblox can release a new feature, but if it's for the Builder's Club and up, the non-Builder's Club members riot. It happens a lot, given how much they get updated.
The 2016 update that removed Tickets as a currency was almost universally hated at first. Not only did it almost collapse the game's economy overnight, it also removed the only source of income that non-developing players (read: 90% of the playerbase) had. Many believed Tickets (or Tix) were removed specifically to force everyone to buy Robux. Despite this, many older users in the community grew to understand the update much more, as it was an attempt to fix the ROBLOX economy (due to the Trade Currency system completely breaking it) and even admired it in some cases.
At the beginning of 2017, Roblox changed its logo to what it looks like now with red text spelling it out, with a tilted square O. This let to many people absolutely hating the new logo, since they all think it is uncreative and too damn simple. It also made the famous R letter icon that symbolized Roblox, being replaced with the titled square O. Even the studs in games were replaced. It even led to plenty of funny jokes about the new logo, with people saying it looks like a Cheez-it, or a ripoff of the Domino's Pizza's logo.
Ditto with the forums getting entirely removed in December of that year, though many people later realized that with the toxicity of the forums, they brought it on themselves.
The "Anthro", later renamed "Rthro", models have gotten a lot of criticism for looking too much like normal humans and not blending well with the blocky nature of the game. When they were actually released in Q4 of 2018, some users actually took a liking to the new designs of the humanoids, while others found them So Bad, It's Good and used their body parts along with already existing costumes/packages for surreal avatars.
An update removed the active servers on a game's page, leaving you to only see server which had your friends on it. Thankfully, the old format was reintroduced alongside the servers containing your friends.
They Wasted a Perfectly Good Plot: The 2018 Hallow's Eve event had an interesting premise, with the event spanning across 10 games connected to a hub. Unfortunately, only 3 of the featured games (Roblox Escape Room, Robloxian High School, and Darkenmoor) had actual event objectives while the others had to be discovered through the hub to actually obtain the prizes, nothing more.
Uncanny Valley: An infamous group of developers were caught applying ultra-realistic faces to Roblox avatars. No wonder they were nicknamed the "Uncanny Valley Community". Take a look here.
Friendly Smile, with realistic eyes and shaded mouth. Many players found this face unsettling.
In the Roblox Anthem video, a girl comes up to see the robots (and the noob) tumbling down, and grabs her phone and starts taking selfies with a selfie stick.
Fidget Spinners have been added into the catalog. Several games also let you pick up Fidget Spinners for free.
The addition of purchasable R15 emotes was believed by many to have been added to capitalize on a similar feature in Fortnite.
What Do You Mean, It's for Kids?: Roblox is supposed to be for all ages, but it has the same issue as a lot of other all-ages building games in that the interpretation of "all-ages" leans closer to "stuff that appeals to different age groups" rather than "stuff that is friendly for children". While there are limits to what can be added (although some stuff can get by accidentally until someone reports it), there is a rather high tolerance for Family-Unfriendly Violence and minor swearing like "damn" and "hell" has a tendency to get by the filter. It could qualify for the opposite trope too since the game contains some items limited to users over the age of thirteen (mainly some realistic guns offered as gear) and there are individual user creations that are definitely aimed for an older audience.