RT is the last site movie site I would actually look for for reviews. Movie critic reviews are, for the most part, a waste of breath and ink. I tend to check out imdb, and pretty much anything rated above 6 will probably be pretty good, but I'll still check out user comments.
I agree Rotten Tomatoes just isn't very good IMO. The one I check is Box Office Mojo. Usually how the movie does with those viewers is usually in line with how the movie really is. As for The Book of Eli, it really is a good movie. Some nice twists in it as well.
