Dreamcast:
I too bough a Dreamcast after it had died and used ones were going for under twenty bucks. It seems like the Dreamcast is really to thank for me getting "hardcore" into gaming, but when I look back I realise that I didn't play that many games on it, and the ones I did play were all the AAA titles everyone was talking about. I have to wonder if I would have been dissapointed in it if I had bought at Launch and there gap between these titles was months, instead of just the time it took me to beat the one I was currently on. Notables: Soul Calibur, Jet Grind Radio, Crazy Taxi, MvC2, Grandia II and Skies of Arcadia.
Playstation 2:
The PS2 is without a doubt my most used system of this generation, and I own the most titles for it as well. But since online gaming has become so important to me I'm finding my self playing it less and less. Yet, whenever I do come back it's always for an amazing title that nothing on Xbox or GC can really compete with. Even though graphically it's showing it's age, and even though it's online system is horrible, I think the PS2 is still the "winner" of this generation due to it's massive library filled with more AAA titles than any other system this generation. Notables: Final Fantasy X, MGS2 and 3, Jak series, Ratchet series, Sly series, GTA series, Onimusha trilogy, Xenosaga series, Gitaroo Man, Katamari Damacy, Amplitude, Disgaea, Klonoa, Suikoden 3, God of War, Star Ocean 3 and ICO.
Xbox:
Obviously my new system of choice, I was really suprised by Microsoft's system. I bought it last, only becuase it was used, and I was really expecting it to be my least played system. At the time I didn't have live and most of Microsoft's first party offerings were complete trash, but eventually I amassed a collection of games that were not only amzingly high quality but also because of Live had near endless replay value. I think the Xbox did a great job this generation, but since it really doesn't have as many exclusive titles that I want to play as the PS2 does, I really can't give it top honers. Notables: Halo:CE, Halo 2, KOTOR, PGR2, Armed and Dangerous, Fable, Panzer Dragoon Orta, Crimson Skies and not to mention highest quality versions of multiplatform games like BG&E, Prince of Persia and Burnout 3.
Gamecube:
The GC, like the Kennedy's, had a lot of potential but never really did anything. I had hopes it would get it's online game together, and get some quality third party support, but obviously that never happened. The only games worth owning on it now are Nintendo games, and the good ones are in small supply. When I go to gamestores now, I can hardly stand to look at the GC section anymore; it's small in selection, and every game looks aimed at 5 year olds. Nintendo really dropped the ball, and I seriously doubt I will ever buy another one of their systems again at anything near full price. Notables: Animal Crossing, Super Mario Sunshine, Metroid Prime, Legend of Zelda: Wind Waker, Wario World, Super Monkey Ball, Tales of Symphonia and FF:CC.
