I've played Metroid, Metroid Fusion, Metroid: Zero Mission, Metroid Prime and Metroid Prime 2. I never beat the original Metroid, but I think it's really fun for a really difficult game. I have Fusion and Prime, and used to have Zero Mission and Prime 2, but I lost Zero Mission (someone may have stolen it) and I got really bored with Prime 2. It didn't draw me in like the first Metroid Prime game did, and the multiplayer was terrible. I might buy it back to give it another chance, though. Sadly, I have yet to play Metroid 2 and Super Metroid, but alot of people I know claim Metroid 2 is the best game in the series.