I don't trust game reviews.
But when i vote at imdb or anything, i'll use this guide:
10 - A Masterpiece, Genuinely Groundbreaking
Something you didn't think was possible before. Not only is it essentially flawless, but it genuinely sets a new standard. A vote of 10 should be rare and reserved for very, very special movies. Please consider whether a lower score might be a better match of your impressions before voting a 10.
9 - Outstanding, a Must Have
Not just something you'd recommend to anyone, but a piece of content that you consider an absolutely mandatory piece of any movie shelf. Highly influential; many movie makers will mimic it and they are right to do so.
8 - Excellent, Recommended to Anyone
There's a lot new. It can be an influential movie. If it is a niche movie, you still would recommend it to anyone because you had so much fun or you found it to be so impressive. This is the kind of stuff that makes movies such a great thing to watch.
7 - Very Good, Deserves a Look
Some elements of this content are unique and you enjoyed it without substantial reservations. But you might be able to imagine some others having complaints or just not enjoying it as much. Still, you think most people should at least take a look at the movie description and voter comments to see if it sounds appealing.
6 - Good, Qualified Recommendation
It does a few things well but maybe it's a bit routine. Or, perhaps you found it enjoyable and something that you're generally positive about, but also found that it has enough drawbacks that it's not something you can recommend without a caveat. It's a good movie, but it's a little hard to find superlatives for it.
5 - Fair, Solid yet Unremarkable
It's not that it's bad, it's just not that good. Maybe parts of the movie are great, but other aspects of it bring it down. Or, perhaps the whole thing is just thoroughly average. It's not that you feel cheated with your time, but you can think of similar, better movies. You wouldn't discourage anyone from playing/using it, but you wouldn't go out of your way to recommend it either.
4 - Some Merit, Requires Improvements
There is something good in this movie, even briefly enjoyable, but it is buried under other plot problems. While you might briefly consider giving it a positive recommendation, you just can't unless some serious work is put into it.
3 - Poor Execution, Potential Unrealized
The producer clearly set out to try to do something interesting, and may have had a good idea or two. But s/he failed to produce a product that is enjoyable or useful at this point.
2 - Very Little Appeal
There really isn't much positive that you can say about this. The ideas are poor, the execution is poor...everything about this is poor. What separates this from a vote of 1 is that the producer had some interest in making something enjoyable--it's just that they failed to do this.
1 - Not Recommended to Anyone
There's just absolutely nothing redeeming about this movie. Perhaps the producer was intentionally trying to annoy, insult, or upset you. Or maybe you wouldn't call this a movie at all. Please note that 1's should be even more rarely awarded than 10's--use them with extreme caution.
Stolen from a NWN forum and modified to fit movies..