1. Karts. I can determine turns way better and drifting in front of people and/or hitting bikes doing wheels are hilarious cuz they're like WHOA OMG and bikes lose balance and you lose your wheelie if hit, which is good.
2. Lame as all crap.
3. All of them, basically. SMK and 64 are a lot better than any in terms of actual skill in driving techniques and DEFINITELY **SENSE OF SPEED** I hate feeling like I'm crawling in MK:DD and MKWii even in 150cc. 150cc is about 2% faster feeling. Long straights suck with anything other than 150cc.
4. Mid. Although, I'm weird about who i use in games (like kart and party). For SMK I use Toad; MK64, Luigi; MK:DD, M&L, M&W, or the Koopas; and in MKWii I use Mario exclusively.
5. I dunno something cool.
6. None of them.
7. GCN controller, definitely. Screw the Wii Wheel.
8. Maple Treeway, Moonview Highway, and a few others.
9. Mario Circuit 3, Ghost Valley 2.
10. Worse new course.... Moo Moo Meadows, Coconut Mall, DK Summit (virtually the same as the GCN DK Mountain except a halfpipe and if they put a clone of that in the game why did they include the GCN version of it also, AND DK'S JUNGLE PARKWAY?!?!), Grumble Volcano, Dry Dry Ruins.
Worst retro course.... GCN Peach Beach (LAME), DS Yoshi Falls (LAME), GBA Shy Guy Beach, DS Delfino Square (Why not Waluigi Pinball?), GCN Waluigi Stadium (where's Wario Stadium instead?), DS Desert Hills (barely fun, Dry Dry Ruins is its clone), N64 DK's Jungle Parkway.
I have a lot of hates on their because they did a crappy job picking 80% of their retro tracks.
Someone also said Coconut Mall has the biggest jump in the series...... that is stupid. Peach Raceway had the most awesome, longest, and biggest jump in the series (EXCLUDING ALL THREE REPETITIVE BARREL CANNONS)... and it actually shot you out, instead of you flying up and coming down instantly after you were done boosting like MK:DD and Wii.