Sadly, ratings are a waste of time, unless there are a lot of them. The problem is that profiles may be geared towards one genre and the person checking them play in a completely different genre. I've tested profiles that were rated high, and didn't fit my genre (classic rock, hair metal, etc.). Others with low ratings were fantastic for my genre.
Too many people give crappy votes because the profile is not geared towards their "percussive" music style. Personally, if a profile doesn't sound good to me, I just move on without voting. It just might not be geared towards my genre of music.
A while back, I mentioned that a genre list might help people find what they are looking for, and not down vote the ones that are geared elsewhere.