I picked it up along with an extra wheel; the game comes with a wheel and only costs 5100 yen, which is surprisingly low for a game and (yet another Wii controller) accessory. Better than the zapper (lol) price.
I played the first circuit in 50cc mode (karts only) and made the mistake of picking automatic drifting; I glossed over the menus really quick and thought that was transmission for some reason. So I start up and find I can't do anything but use items and hit the brakes; there's no drifiting or jumping, and I'm thinking the game sucks. The first three tracks in the mushroom cup are also pretty bland made it quite boring. On top of that, the AI seemed to continuously receive the (unavoidable) blue shell and POW items, where as I never got either one once. It made things annoying. The fourth track has much better design than the first three, and that made things better. Same goes for the game play once I picked manual powersliding, which gives you back your jumps. Powerslide into turns and you gain a burst of speed, just like the previous title. No snaking this time around, however. The Wii wheel casing you get with the game works great. Turning is no problem; the controls are very responsive. If you don't like or don't have a wheel casing, there are other control set-ups available. 100cc mode is for bikes only; I tried this briefly and found the bikes were of course faster, but also a little more difficult to control. Sliding in particular feels different. 100cc class is a mix of both karts and bikes. Battle mode seemed just as fun as ever, although with so many players in the same arena, it took forever to win. There are older tracks from all the previous games; my favorite Mario Kart is the original and the regular (and battle mode) tracks do not disappoint. They have been recreated to have a very SNES-like feel in both their textures and music. Fans won't be disappointed.
I *HATED* Double Dash and never really got into the DS Mario Kart, but I am liking Mario Kart Wii so far.