I used to follow hyped up games incessantly. Checking every screen shot or video and reading every tidbit of info. It almost always resulted in being dissapointed or at least thinking the game was good - but could have been better. This happens with movies too, if I watched all 4 trailers and read a review it's the same thing. So these days I'll read a little preview to get an idea, then maybe read some spoiler-free reviews to see if it has the content I want, and then just go straight to purchase if it's looking good. The less I know, the better.
A good recent example is Heavy Rain. I first read a review for it a while back basically outlining how this game will be different, then just ignored all the hype and everything till it came out. Read the review, saw it had a good outcome and sounded fun. So, when I played it, I was so ignorant as to what was going to happen that it was just a great and amazing experience.
I think adds are good, I think reading a spoiler free review and maybe seeing a few screen shots are good, but the less I know the happier I am.
...I saw the article on God of War sex scene, and I have to say, I really, really wish I was ignorant of that. Think how much better (funny) it would have been to just happen across that while playing the game? So yea, I try to avoid too much information.