These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Base Breaker: Of all the updates, the BC-only place option update did this the most.
Several other Base Breakers included disallowing free users to get Robux, the update that changed jumping physics, making the 2010 Easter event only fun for Builders' Club, gear, constantly making Robux-only items, and the advent of Turbo and Outrageous Builders' Club.
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.
Difficulty Spike: The Festive Gift of Impossibilty from the 2013 Giftsplosion: Even the second-hardest badge out of those you need to collect is just challenging at worst, but the Bandit badge makes the gift live up to its name, being far harder than any of the other gifts.
Fan Dumb: "MAKE BUILDERS CLUB FREE!" "THIS HAT IS TOO EXPENSIVE" "OUR TEAM IS BETTER"
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. I dare you to find a course without a balance beam, lava jumps (checkerboards are popular in this category), small platforms, invisible walkways, a maze, or a quiz.
Memetic Mutation: The team is quite fond of including memes in item descriptions.
"Blame John", although that's more of a staff in-joke.
The new TV commercial brought up several, like "IT'S FREEEEEEEEEEEEEEEE!!!" and "DESTROY EVERYTHING!!!"
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 3.0 Bodies have been rejected by millions. Roblox deleted negative comments to control the flow of feedback, which would make their bodies look good. Think about it: 1 thousand who like it against millions who hate it! And there's even some things that will cause this update to be the renegade: