hey for me anything that can run anything as good as HL2 is all i need.. graphics wise and we know the WII can do it.. anything over is EXTRA..
as for games i think REDSTEEL was pretty hardcore (though not AAA but it was pretty good at launch) and ZELDA was awsome for me.. it was the first one i wanted to pick up since ORCARINA OF TIME.
i have elebits and its nowhere near casual.. as well as GODFATHER (played if first time.. i waited and refused to play it on PC because i wanted wii controls and u know what.. even my friend who played it on the PC and has it for the PS3 was like.. THIS IS SO MUCH BETTER WITH THESE CONTROLS) and i know its an old game but right now i'm trying to finish SCARFACE and again i never played it on PC or XBOX but i am loving it on the wii.. graphics are there (GOOD ENOUGH) and the controls are pretty sweet.. especially aiming..
as for casual games i got BUST A MOVE.. and RAYMAN.. plus my GC collection..
now if u really wanted to argue games u can go the PS3 route and be like.. "there may not be too many PS3 games but we support over 250 PS2 games which u can play on our console" (this was said on one of the new IGN podcasts.. then they were like "DUDE IF U WANNA PLAY PS2 GAMES BUY A PS2.. ITS CHEAP!" well the wii is backwards compatible with ALL GC games that i know of.. never heard of problems in that department.
and METROID and GALAXY plus BW2 and SMASH are pretty hardcore games and ONLY FOR NINTENDO..
lets face it when WII came out everyone (including me even though i stood in line on November 29th to get one launch day) thought it was gonna be GC2 and i pretty much bought it for SMASH BROS. but now i see there is support coming..
and the wii had a pretty good LAUNCH line up.. definitly beat the GC which had what.. LUIGI'S MANSION? it was a fun game but c'mon..
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