Why is that? Perhaps for some people it does deserve that score, or even more.
You can't say "X game doesn't deserve more than Y score" without explaining your reasons for that statement. If you do, it seems like you're gratuitously shitting on the game. Maybe the game is good, at least in the eyes of those who reviewed it, and you just happened to not like it. And I say this as someone who was disappointed with GTA IV. Would I have scored it with a 10? Of course not. Is it wrong that other people did? Nope, apparently they thought it was deserved (or, if you want to believe it, they may have got some benefits for scoring it that way, but that's a completely different matter).
There's no "objective score" that a game should get. It's always subjective.
Nah, I'm not excited either. I mean, I'll probably play it someday, but I can think of at least 10 games I want to play more than that.