Well, off all the games you mentioned
Oblivion - 360/PS3
Mass Effect - by Bioware = Baldurs gate
There's a lot of cross platform RPG's coming, so they're about even there.
Of exclusive note though is The JRPG's like Blue Dragon and Lost Odyssey.
Not to mention things like Two worlds, Warhammer online, Overlord and Age of Conan, but I think a lot of those are PC & 360.
RTS, PC's going to win no doubt, BUT
Battle for middle Earth 2
Command and Conquer 3
Halo Wars
Are all RTS on the 360, so you wouldn't go without
Of all the shooters you mentioned only STALKER hasn't been announced for console but UT, GRAW and BF(Modern Combat and Bad company) are on 360 and some on PS3, as well as some really fantastic 360 exclusives like Halo 3, Gears of War and Shadowrun (actually 360 vs PC!).
I remember F19!
Flight sims, I don't play so can't comment qualitatively, but there's blazing angels, Battlestations Midway, Over G fighters and Ace Combat 6 coming out shortly, and Project Sylpheed if Space combat is your thing.
On the keyboard and mouse bit apparently some PS3 games let you use kbms for FPS, i think resistance. Please can someone else confirm whether it's true or not. I know Epic wants to do it for Unreal tournament 3.
what you do get a lot of on Console that you don't get on PC -
racing games: Forza 2, DiRT, PGR, GT.
"Platformers"/ 3rd person action. - Eg Dead rising, God of War, Kameo etc.