Review scores really affect my hype for a game. Low scores bum me out.
Anything at 90 or higher tells me the game is top notch. Between 90 and 80 tells me the game is still a great experience but with definite flaws. Obviously the closer to 90 it is the less it matters. Anything below an 80 really makes me question the game. If it's below a 70 it pretty much tells me the critics collectively thought it was garbage. I may not necessarily agree but I generally feel the same way about a game that the critics did overall.