Here's some games that haven't been mentioned as much, but are still a ton of fun.
Extreme G. Take Mario Cart. Replace Carts with motorcycles, turtle shells with heat seaking missles, and the Mushroom Kingdom with futuristic offworld racetracks. Add in awesome techno soundtrack. Be warned though, this is a hard game.
Wetrix. An odd puzzle game. You get different shaped blocks to build walls on your map. Eventually, it starts raining, and you get some water blocks. If too much water leaks off the edge of your map, you lose.
Blast Corps. A truck carrying a nuclear reactor thingy has lost its brakes and its ability to steer. Destroy everything in its path to make sure it doesn't crash. The only game to this day that I have in which you can power drift a Tonka Truck to smash a gas station, and use a flying robot to curbstomp a skyscraper to the ground.
EDIT: Smash brothers has been mentioned. Good game.
Also, if you like arcade games, RAMPAGE is fun. You're a giant monster, go and level everything!