As a reviewer, I can probably be quite harsh on some games. Not so much the budget, less-heard of games, but the popular titles that everyone loves and rave about. I find much of time they're not as great as the industry makes out.
For the whole of 2007 and 2006 I only rated five games above an 8/10. Admittedly, I missed some of the RPG's like Oblivion. But Fallout 3 is not over-rated at all, it deserves all the praise it gets and I'd say it's certainly in the top 10 games I've ever played.