Mario Kart has never been perfect, nor has it ever been so much fun...
Mario Kart Wii is better than the others, but far from perfect. The new courses are fun and imaginative, the online play is flawless and the gameplay surprisingly addictive. However, there are many flaws to the mix, the most annoying being that whenever you hit a wall, weapon, other racer or boundary, you slow right down. The other main issue is the rubbish AI. The addition of two new weapons, bikes and jumps make this a worthy addition to the collection however, and you will find yourself spending hours upon hours with the online mode.
If you have a Wii, I recommend you take a look at this games, but I would forgive you for skipping it all together. If you have children this is defiant look. Otherwise, a letdown in some areas, redeemed by online play and fun courses.