Thing is, 7 has been 'meh' ever since we started getting magazines with 'official' in the title (I'm looking at you, ONM!). Only NES game I owned that was scored less than an 8 in that mag was the first Ridge Racer... which I hated. On the plus side, meant I very rarely played a bad game in my formative years (go Chip n Dale rescue rangers, SMB3 and Zelda!)
Edit: I think Mega Man 2 got an 8, and I loved it so much i bought all the rest in the series (up to 6) and some of those got 7 or less but that was series love and I don't think I read the reviews until after I'd played them. Remember going nuts with my parents over my pocket money because I found Mega Man 4 in a Boots in london and just had to have it!.
These days, unless the review mag is Games(tm) or Edge, then I don't expect to see a game that is worth paying the money to play get less than about 85% or 8/10 (Games and Edge rate harsher than most, so their numerical rating is a lot more relevant than the sycophantic likes of OXM, PS3M etc.)