To be worse and more unbalanced than Mario Kart 64 takes effort.
Mario Kart Wii has the same probelms and worse than Mario Kart 64. The Mario Karts inbetween have issues but to reach as low as MKwii is a masterpiece itself.
Like MK64 very few music pieces will even seem listenable. The tracks are terribly designed. They are actually designed mostly for a certain power up mentioned later. Resulting in terrible crap.
There are different Karts, cars(?) and Bikes in this game you can choose with characters. Which are all unbalanced. From speed to how they turn, each one has issues and others fix the issue and have issues somewhere else.
The balance of power ups is gone. There are so many prevent first place, get out of last place, and homing weapons it's terrible. A great new one is the power up that turns your racer into a rocket for around nearly ten or so seconds, which allows a player to pretty much guarantee to ranks in the race if not first place. Which could also be easily taken away, To win in the game you need to only know how to move just a bit and the rest is relied entirely on luck.
The Online mode is laggy beyond comprehension, and the multiplayer battles comprise of stiff controls and lag, yes lag OFFLINE.
The game is a wash up. I have to say it took effort to get this bad.