Hardcore -> B3D, FPS, GeOW, Halo, M+K/B, 8800GTX, Bioshock
Um... Whats with everybody thinking FPS games are hardcore? The FPS genre, is after racing, the most sold genre on both the PS3, X360, Xbox and PS2. Halo is not hardcore, GeOW is not hardcore. Bioshock, neither of us have a clue about whos buying atm. Sales numbers alone tell you that FPS cannot be for the hardcore crowd only, unless you think 40% of the PS2 owners are hardcore.
Mainstream -> FFXIII, MGS3, DMC, IGN, NFS, GT4, Dead Rising, Metroid Prime, EA Sports, WOW
Metroid is mainstream? The first title sold 3millions, the second one barely reached a million and a half (GeOW sold 4million..) on a console with a 20 million userbase, yet this game is mainstream and Halo 1 & 2 (15?? million combined) is hardcore.
Casual -> Wii sports, Nintendogs, Brain Training, Uno, Solitaire, Zuma, MSN Games
But then again i'm sure many wouldn't agree with these definitions..
Your right, i completely disagree with them.
Hardcore: MMORPGs (- WoW), "uber"-realism FPS games, real racing sims like GTR 1 & 2 (no, any incarnation of GT is not a real racing sim), strategy games (both RTS\TS)
Mainstream: General FPS gaming (most sold genre after racing on the PS2. Most sold genre on the X360, most sold genre on the PS3, do not try and tell me FPS games are hardcore). RPGs, racing games, GTA style games. Sports games.
Casual: Sports games, GTA style games, racing games. Anything that gets enough advertising on TV really.
The biggest difference between the groups IMO, aren't what they play but how they play it. Casuals rarely play for very long, and very often play mostly when they have a friend over. Whereas the mainstream gamer plays longer, and often harder games, maybe even online. Hardcore players play even longer, own more games, mostly play alone, and they often strive to "best" a game.