*coughMAMEcough*
I don't really like the PC vs. Console gamer nonsense (I even made a thread of it somewhere here) especially since I play a lot of PC games that are also console games but don't play many PC-specific genres like RTSes or a lot of FPSes. So despite being in front of the PC fairly often I'd say I'm in the console camp (go Nintendo!), however, when comparing a PC to either Xbox specifically, a PC to me is an obvious choice. If the Xbox had more exclusive games, that'd be a different story, but geez, even Microsoft's own also come to the PC eventually.
Games were never hard to install on a computer - and thanks to Plug-and-Play and autodetection of settings and homogenizations and standards and other improvements in PC gaming in the past, I dunno, DECADE, it's really hard for me to believe it when people tell me it's so much easier to play games on a console. Yeah, it's easier, but it's not like playing the PC version is so difficult that it's not worth infinite saves, screenshot-taking, modability, etc. And console gaming isn't cheaper either...maybe it was, but you can get some decent (or at least decent-enough) video cards for less than an Xbox 360. Then there's the plethora of USB adapters that let you use any controller on a PC, and many video cards these days can output to a TV, etc.
Nintendo themselves make many of the best games for their consoles, so of course Nintendo gaming and PC gaming are different enough. But PC gaming and Xbox gaming? I guess there are some Live features but overall they're not different enough so you might as well upgrade your PC since you clearly have one (unless you're posting from a Mac I guess).
There I go ranting again.
The PS2 had exclusives, sure, but really it was more like developers never bothered to port or convert games for the less popular systems, not a loyal pledge to Sony themselves. Now that games are so pricey to develop, I think we'll see fewer exclusives, so the PS3 library, Xbox 360 library, and the PC library will become even more similar than the PS2/Xbox/PC that it won't even be funny. Everyone's expecting FF XIII and MGS 4 to lose exclusivity so I wouldn't be surprised to see them on the Xbox 360 and eventually the PC as well.