Less viruses/adware feed into Opera than IE/firefox. The general thought process is "who the fuck uses opera?" so the sneaky bastards don't bother looking for easy ways to backdoor that shit in like they would with the other two.. Even though it's a resource hog I find the obscurity alone worth using it.
Sure enough, since I started using opera I get far, far fewer hits from Spybot. That said, it's a buggy fucking browser if there ever was one. I really want to slap someone for that.
And I occasionally visit gamespot for the same reason I visit any website... information. Can't get everything from one source.