-Game is p2w and grindy af(yeah i know this one is well expected)
-Everything is too unbalanced(powerups-esp : that purple orb or whatever it is, once it hits you, almost no chance left for u to keep up with the others-, the lvl gap in matchmaking, racer's skills/special-some skills are too deadly, some are just, oh come on, might as well leave Sulley with no skills at that point)
-there are tons of tracks, and i must say the design of those tracks is pretty cool. however in multiplayer mode you're only given one or two different tracks to race on. So you're forced to race on the same track like over and over again. And what's the point of scattering those toy boxes and balls along the track(multiplayer) that normally doesn't have those kind of barriers? Only makes the game looks lazy and unispired.
-Some challenges are too difficult with ridiculously very small rewards(such as bumping the rivals 300 times in multiplayer mode with only 365 xp being given as the reward) in the other hand some that considerably easier and can be finished pretty quick give you 700xp. How nonsensical that is.
-Controller support on mobile is a must since it's a cross platform
-Last but not least, those notifications(or whatever you call it) during the race is really annoying