I haven't had much experience with any of the other four. I'm not 'with it' game-wise, having been a Mac user since 2006 and owning a PS1 and an N64. There's a lot of mediocre content out at the moment and I'm not convinced that the move toward short single-player campaigns is a good one. When I buy games, I buy it for the single player and if the multiplayer is good, then that's an advantage. I always remember playing Jedi Knight II: Jedi Outcast and being impressed with the multiplayer and the only game I ever played regularly online was Medal of Honor: Allied Assault. I was on the UK League top twenty regularly there with my clan.
Consoles have always been too expensive for me to justify buying, hence why I own an N64 - I picked it up for £20 and the games are cheap and fun. I don't understand the mindset of being right on the cutting edge for the sake of it either. Old games are fun too and the only way I could justify buying a high-end system would be if the games were absolutely killer. I won't get a PS3 because I'm not convinced that I desperately need to play them and the console is expensive. The 360 has a lot of games that I like and Red Dead Redemption is slowly working its way into the 'necessary' category, but I'm not there just yet.
Black Ops? Oh it's fun alright. But it's no masterpiece and it's hideously hyped.