What do you think is the worst thing about this game?

For me its either:
The characters have individual stats meaning everyone just goes funky kong in time trials
or
Although it makes perfect sense, I feel it would have been better if you could unlock any vehicle for any character E.G.(baby mario able to use the standard large) similair to Mario Kart DS.

Worst for me is Battle Mode.

i dont like the effect where if you touch the wall you stop(useful yet dumb)

Yeah the Balloon battle could have been alot better. such as if the balloons represented your lives and once all balloons were gone, you were out of the game.

I love the Coin Runners though =D

Yeah, I'm not sure why that decided to do that. It can really screw you over.

ya(message to short)

The thing i hate about this game is nothing. its perfect for me

Nintendo arent watching, it's OK to be honest nothing will happen
: )

The fact you can get Lightning Clouds in 1v1 races is probably my worst complaint, it makes 1v1 races pointless.

Good point, but if you are skilled then you would either be close enough to pass on the lightning cloud or so far ahead it wouldnt matter.