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.
YMMV: Paper Mario: Sticker Star
Awesome Music: See Paper Mario. Every track is a lovingly written, appropriate, and above all else jazzy track, though fans who don't care for jazz may be alienated.
Broken Base: Many fans are not happy at the changes made in Sticker Star, such as the consumable item based battle system and the removal of partners.
Some fans are having problems with the game putting more emphasis on being Paper Mario, if only because it comes off as the concept being watered down to the Lowest Common Denominator. As such, the game has been compared many times to being more similar to a New Super Mario Bros. game with paper aesthetics, than staying true to its own roots.
Interestingly enough, one of the major motivations for the development team after Miyamoto insisted on no story (or at the very least, minimal story) was to survey Club Nintendo members to see if they liked the story in the previous games. Not even 1% responded that they liked the story, and the response generated led the team to moving in more of the emphasis on paper. As a whole, this seems to suggest the fans of the story who have the above mentioned Broken Base were not properly surveyed at all because Nintendo only limited themselves to Club Nintendo; either that or even a Periphery Demographic.
Critical Backlash: When you view this game on its own merits (separate and not comparing it against the previous three games), Sticker Star can be an enjoyable Metroidvania even with some gameplay problems.
Dude, Not Funny!: When you rescue the Toads in Decalburg, a lot of them make a big deal out of how terrifying it is to be trapped where no one will find you. When you succeed in unfurling Decalburg, you trap a Green Toad under the entire town, with no visible way of getting him out (thankfully, you can — Paperize the fountain when you come back). The game attempts to play this for laughs, but it can be fairly disturbing.
Ensemble Darkhorse: Mariachi Shy Guys and Gooper Blooper for the music theming behind them and being plain hilarious, and Mizzter Blizzard for being a Tragic Monster and having more characterization than anyone else in the game.
Guide Dang It: The most common complaint about this game is that figuring out what Things do what and where to find them isn't easy to figure out. (Missed the Lightbulb in Yoshi Sphinx? Or any plot-related Thing for that matter? God help you trying to even figure out what world the Thing is in.) The game doesn't allow the possibility of "Try anything with everything" due to stickers going away when used, even when it's not the correct answer.
It can be really hard to figure out where the fourth wiggler segment is supposed to be before it's marked on the map, unless you find it from the get go.
How to get to the Comet Piece in Tree Branch Trail is fairly non-obvious.
The "hint system" is all over the place, ranging from helpful to practically useless. For example, when you have three Wiggler segments and are looking for the fourth, Kersti will never say anything other than "You should get the fourth Wiggler piece!"
Memetic Mutation: "NYARGLEBARGLE!" Explanation The phrase Bowser Jr. shouts when he starts crumpling a bridge into a ball.
The Goat sticker, as well as the new Mariachi Shy Guy enemies.
Kersti referring to and describing Kamek as a hipster.
Scapegoat Creator: Many people are pointing to this title, among other incidents, as evidence that it is time for Shigeru Miyamoto to retire from active game development and advisement (which may or may not be a fair statement). What side of this coin fans lie on in terms of supporting this sentiment could fuel the careers of dozens of analytical authors. According to this, he's the reason the battles were changed. Why? It was too similar to The Thousand Year Door.
The Scrappy: Kersti has been described by many as "forgettable", a fairly big deal for the only new character in the game. She's also disliked for the opposite reason most exposition fairies are disliked: most of the time, when you ask her for advice, it's vague and unhelpful.
Oddly enough, basic combat has become this. Due to removing experience points and levels, most battles do not offer a real reward and as a result feel like padding. Battles can offer you money, and occasionally health and stickers, but you find the latter two in the levels themselves usually and you can find the former at the end of every level.
The hammer. Getting the proper action command is just about up to luck, and there's little of a cue in order to use it. Of course, they're some of the more common items in the game.
That One Boss: Kamek, especially the second fight against him. He transforms all of your stickers into flip-flops, so you better took note about which sticker was what, lest you use up some really valuable ones here. The first fight's not too bad, since he's alone. Come the second time, where he creates two clones of himself, change altitude so no attack will hit, and making a random sticker of yours disappear. Often enough, Kamek and his clones will fly too high for you to do anything, making you waste your turns and stickers.
The Giant Cheep-Cheep at Surfshine Harbor could count as well. It starts off easy, but then the Cheep-Cheep dives into the water and recovers ALL its health, and remains in the water. At this point, you MUST use the Fishhook item to reel it out. Then, the Cheep-Cheep will start puffing up until it pops and kills itself. Sounds too easy for a boss, right? Oh, I forgot to mention it also kills you too if you don't have armor.
The Final Boss, even though it's, well, the final boss, is a ridiculous leap in difficulty from the World 5 boss. 5 phases, each of which require at least 1 Thing Sticker to make them at least manageable, and the boss is spiked. Even after following a guide to the letter to prepare for it, it is still extremely difficult.
That One Level: GAUNTLET POND. Tricky jumps, maze-like structure, poison everywhere and the escort mission can be very infuriating if you manage to make the wiggler segment drop, and having to go through the poisonous swamp and restart that part again.
World 3 in general, due to being nearly twice as long as Worlds 1 and 2 combined, being so ridiculously dark it's tough to see, having annoying and creepy music, having poison absolutely everywhere, the Wiggler piece collection quest, and the tough boss at the end.
World 4-3, The Enigmansion. This level is TERRIFYINGLY long and confusing, only because you have to capture 100 Boos. Luckily some appear in groups during battle, but they're still hard. Most Boos have 18 HP total (a few of them have only 1 HP, though). Good luck trying to defeat the five Boos that fight you under a disco ball. Or the sheets of 82 Boos combined together. Once you've captured all 100 Boos, you put it back into the basement and... Kamek appears and turns the Boos into one big giant Boo. You'll either need TONS of Spike Stickers, or any member of the vacuum family.
The Secret Blue Door in this level doesn't help either... it will send you to an area blocked by a cardboard thing. If you knock it down, you'll find out you're back in Decalburg.
It actually does help. Once you start either World 4 or 5, you have to fight Bowser Jr to get back to the first three areas. If you need Things to help you, you can use that door to get back. If you started World 5 first, however, there's no way back.
It's the Same, so It Sucks: Miyamoto wanted the battle formula changed because he thought it was too similar to The Thousand Year Door. (See Scapegoat Creator above) So, we got the stickers. While they change the feel of the game, it's the same core battle system as before, except items (now stickers) are more plentiful and slightly more varied.
Plot wise, it also gets this in comparason to the mainstream Mario series. While Paper Mario was well known for its previous two titles adding new storylines and having memorable characters, Sticker Star was, give or take some elements, essentially New Super Mario Bros.: The RPG. And considering how the New series already gets flack for being repetitive...