I hate numerical ratings for games. Most people are aware of the weaknesses of these things, so I'll just go ahead and not describe them in detail.
I want to rate games based on what percentage of the player base dreams about the game.
I find that every good game - each one - gives me a dream or three. This seems to be pretty common... to the point where I think it's probably universal. Unfortunately, since most of you don't remember your dreams very well, this ranking is basically impossible. I can, however, rate games based on how many dreams they give ME.
This makes my ratings pretty skewed towards gameplay. After a bit of playing, I dreamed about Disgaea, about Bookworm Adventures, about Skate. But I never dreamed about Bioshock.
Personally, I think it's because I only dream about games that have a deep level of skill to develop. I'm sure some people dreamed about Bioshock, but it wasn't hard enough to make my subconscious notice.
The funny thing is that this method produces numbers almost identical to those I would normally produce consciously reviewing games. The differences show up only with games like Bioshock, which I feel compelled to rate more highly because of overwhelming peer pressure.
So, I think it'd be easy and effective to rate every game as "no dreams", "few dreams", "lots of dreams".
Unfortunately, rating games like that makes you look like some kind of new-age curmudgeon. "Your game didn't give me enough DREAMS, so it SUCKS. Yeah, yeah, cry me a river!"
At least when I insult someone's favorite game in my normal way, it's something they can respond to. On the other hand, maybe that's a reason to rate by dreams. They can't really call you wrong that way, can they?
Anyway, do you have dreams about games you play? What seems to cause them?