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.
Most Annoying Sound: Beat's "Go-go-gooooo!" line. Made even more annoying by the fact that he says it practically every time he scores a point in Superstars Tennis. Thankfully, he doesn't say it as much in Transformed.
The announcer in All-Stars Racing, who never shuts up. There's a reason they give you an option to turn him off. That said, many adore him because his lines are hilarious and said with Narm Charm.
Pudding's tendency to scream her own name after being hit.
It is always Banjo that hits you with Jiggy Rain when you're in the lead. Always.
That One Level: The Super Monkey Ball maps are built perhaps a bit too much like the levels of their source material. Particularly nasty is the series of 180-turns at the end of Monkey Target, and all of Sandy Drifts.
Best Level Ever: Rogues' Landing is an insanely fun track to play, taking you through the docks, over the floating islands, through a sky tunnel and across a lake (or around it if you prefer) with a great layout, all with an awesome backdrop of the Valuan Empire flying overhead and attacking the islands. But it becomes truly amazing on the transition to Lap 3, when you're confined solely to the air and have to follow the Delphinus towards the Hydra, flying between Valuan and Blue Rogue airships shooting at one another. The final island even has a Valuan ship crash into it for dramatic effect admist the war and race. All this is set to exceptional music which really drives the atmosphere for the laps, and it's not a stretch to say it feels like you're actually playingSkies of Arcadia, at least ship travel wise. Add in all the fan-pleasing cameos that still add something to those who have never played Skies like Rhaknam circling under the islands and you've got yourself an amazing, memorable level.
And the cherry on top? When Sumo presented the Skies of Arcadia level to the game's original producer for feedback, she was moved close to tears. You know a level is amazing when you get a reaction like that.
Burning Depths is this for those who don't consider it That One Level, due to being amazing for drifting and boosting once you've got the hang of it, having an amazing atmosphere with backdrafts of fires exploding everywhere and the track progressively flooding. Chris's navigation lines are also a fantastic touch for the setting, as well as having the Burning Rangers fly around the track constantly. Did we mention how amazing the song is and how it goes hand in hand with the track?
NiGHTS and Reala being vehicles instead of actual characters are also victims of this.
The removal of several characters from the first racing title, most notably Ryo and Opa-Opa, and additional characters from franchises being put in place of them.
Word Of God states it wasn't a case of swapping Ryo and the others for the additional characters as these characters were added with no extra time or budget given, and if they weren't included, no characters would be added in place of them, resulting in a smaller roster than the final one the game has.
The voices for the PC-exclusive TF2 characters sounding incredibly off, Pyro in particular.
Hatsune Miku's possible inclusion as DLC, due to her coming in 2nd place in the DLC poll.
That One Level: The Classic Cup stages get in on this, mainly Sunshine Tour and Roulette Road, because placement is mostly based on luck.
Burning Depths, the penultimate track in the game (not counting the Classic Cup), consists of a lot of extremely tight turns along very narrow corridors, and it's entirely different each lap. It's quite possibly the hardest track in the whole game. In contrast the final track, Race of Ages, is practically a Breather Level in comparison.
That One Sidequest: Traffic Attack challenges drive many players insane out of all the World Tour missions.
They Copied It, So It Sucks: Some Mario KartFan Dumb accused Transformed of ripping off 7 just because it had similar vehicle transformation sections on water and in the sky. The producer retorted by saying that they were actually surprised that Mario Kart 7 had transformation sections as they started the game's development in November 2010, whereas no one knew about Mario Kart 7's features until the E3 2011 trailer, and that the boating and flying sections are very much different from MK7's underwater and gliding sections.