Sorry for the wall of text but if youre interested here my thoughts after alot of playing VV
Right so after like 7 hours of mario kart today and yesterday I can safely it is pretty fucking awesome!
It looks amazing, the controls are generally good, though I found the wii wheel fucking awful, not quite responsive enough making sharp turns difficult, but powersliding seems to be overcompensating for this by being ridiculously sharp, which is a bad thing because you essentially cannot powerslide with the wii wheel. Within ten minutes I'd moved on to the classic controller/GC controller and it was all great. So as far as actual tracks go, assuming there aren't any secret ones I'm missing, I'm really loving all the new ones.
My favourite track is probably Koopa Vale (or something like that x_x) which is slightly reminiscent of rapids, with logs as the track boundaries and fast moving water giving you boosts in certain areas. Generally I just love to look at the lovely green and blue colours though, they really are stunning. Kart-wise, balanced is definitely the way to go. I usually opt for the small standard bike driven by koopa or baby mario because they're good all around and have pretty okay acceleration (sp?), which you need when you're being bombed by shells as much as you are.
Wi-fi is the best Ive played on Wii. Honestly, it's so quick to get a bunch of people and I've yet to have ANY lag whatsoever even in matches with 3 japanese people, a canadian (?), and various EU countries etc. The ranking system is interesting, I'm sure it'll keep me playing more than anything once I've unlocked everything. Basically, rather like in wii sports, when you do well in a race, you gain points (I'd say the average is about 50 depending on how high your score was before) and when you don't do well you lose them. My current score is something like 5520, and I think it would be interesting if we posted our scores in this thread because I don't know how good that is here (although it is better than most people in games I join!).
Unlocking stuff is fun, and is pretty standard fare really, completing the various ccs (it is of note that using the wheel even 50cc is hard) and doing them to star standards. So far I've only managed to get a few characters, a handful of karts and bikes, and the cups that are hidden at the start, meaning there is alot of stuff to unlock that will last you a good while.
So yep, get this game; seriously, though a classic controller or GC controller is pretty helpful.
Oh and to the above poster I found the only use at all for automatic is with the wii wheel because manual powersliding is stupid for the reasons above, I used manual for the rest, feels like you're doing more and it's the corners where you really beat noobs at wifi and cpus. Also writing that remembered me andother pretty important thing about powersliding: you no longer need to wiggle left and right, just hold the slide, so no more snakers, and it really does work, trust me.