I thing about consoles theres what 3 major ones, pretty much all of the games on those consoles can be played on pc. So why go out and purchase those 3 If your computer can handle them games :\
There are many that you can't play on PC and there are many that come out in PC versions that are just bad ports, with an interface that is only slightly modified from the console, rather than an interface designed for the PC. Look at Oblivion and Fallout 3. Those are console interfaces ported over virtually unchanged to the PC version and they feel very clumsy and clunky using them with a mouse.
Basically, my rule of thumb is: if it's obviously designed as a console game, I'll buy on a console. If it's designed as a PC game or the PC version is specially cutomized for PC, I'll buy it on the PC. I'll usually read reviews of multiplatform games to see if the PC version is good or if it's just a lame port. If it's the latter, I'll just get the game for the platform it was designed for (console, in that case).
As mentioned above, games are now a major, bilion-dollar industry up there with the movie industry (and with similar budgets to movies), so yeah, most games are designed to appeal to the widest possible audience, which means, for the most part, dumbing them down. Look at the Transformers movies--there's no artistic merit at all, but there are CGI robots, explosions and a certain hot actress, so they make lots of money, since lots of people like watching CGI robots, explosions and hot actresses even if there's no plot to speak of or anything to make you think. Games are going the same way. Much like independent films, only independent games usually try new and different things instead of trying to appeal to the broadest possible audience.
It's all about the bottom line now. It used to be gamers making games they'd like to play, but now it's big companies making games they think the largest demographic will like to play and the quality and innovation of games are suffering for it.
