I've got Zelda and Excite Truck but I've rented and played Tony Hawk's Downhill Jam, COD 3, Trauma Center: Second Opinion, and Rampage: Total Destruction.
Well Zelda's a given, one of the greatest games ever made. Excite is fun for a few minutes to pick up now and again, but isn't the greatest. Probably not worth $50, but it's a good game nontheless.
Alright one word for Tony Hawk DHJ. SUCKS. I'm a big fan of the Tony Hawk games but this one is just god awful. Gameplay is not very good, graphics are HORRIBLE, way worse than what the Wii can produce, and there isn't really a story line, which is one of the reasons I really enjoy the previous Tony Hawk games. I was entirely dissappointed with this one and do not reccomend it at all....I'm probably gonna hafta get Project 8 for PS2...I have no idea why XxXWiiXxX can get any enjoyment out of this one.
COD 3 was pretty awesome. I thought the graphics were pretty decent and the gameplay was fun. The controls for it work well and I really like this one. I reccomend it.
Trauma Center: Gameplay is fun, but the story line is annoying and sad. The graphics for the story section are just drawn Anime people, no movement and they have about 3 expressions each for the stupid and annoying things they say. Its basically reading text about their pointless lives as doctors and then going into an operation. The operating is fun, but I was hoping for a more realistic and cinematic story line. So this one probably isnt worth $50 either.
Finally, Rampage: Not really incredible gameplay, i mean there's no story line. You just have to beat the crap out of various cities while eating people and smashing cars. What's not to love? I was a huge fan of the N64 version when I was a kid because it was fun to play with others. It makes a good multiplayer game, not for really long continuous play, but to pick up for maybe an hour with a friend or two. The controls are decent, and they've added tons to it since N64: more settings, and a buttload of playable characters: Not just George, Lizzie and Ralph, I think there's like 30 something unlockable characters, all with unlockable moves. I reccomend it, especially since its only $30.