First of all, there is still 4-way madness!! All you do is change the options, and turn CPU off.
Right, well everything said in the GR review is pretty much spot-on. I would like to add though, this is the best mario-kart for a long time!! (perhaps ever), it does have a very few minor issues but certainly nothing worth stripping this game of an A grade.
The wheel works really well, however, I think a lot of expert players will stick with the mote+chuck combo! It does allow for a much faster response time and allows you to compete even after a few beers! The wheel is best saved for multiplayer and battle, when coming 1st isn't the objective, Bashing your mates to bits in the objective!!!
The Wi Fi online is the best yet on the Wii! you cannot find a fault! I have no time with people who complain about the nintendo codes. I see no difference in entering "1234 5678 9012" as opposed to "chunkpwner73". you still entering data!! And the "mario-kart" channel allows you to ping anyone already on your wii's friend list. In other words..... No problem!
Mario kart is a must for anyone, it will annoy you at times, but you won't be able to put it down!!