I like Metal Archives for the fact that it literally has a largest database of bands I have ever seen on one site; it also helps that you can find whatever you are looking for just by giving a few key words.
The point system is a good idea if it is not abused, but -- that in itself is the problem with all systems.
Ultraboris.....ehh; he's given some good reviews (then again, I'm quite partial to some of the bands he cocksucked for points) - I will say this though. You CANNOT take the album rating percentage to be an accurate measurment of the albums quality itself, only you can do that. The good and the bad reviews just help flesh out the different opinions of people. For people who love old school thrash and aren't into some of the more melodic and non-straightforward song structures, well, then Ultraboris' reviews may be good on intention.
I will say he was definately hard on Opeth though....I mean damn.