I try to rate most reviews, but I won't rate if I didn't feel like reading the whole review, or I'm just skimming for opinions on a product. I don't think it's fair to rate if I haven't read it carefully and completely.
I would appreciate it if everyone who read my reviews rated them so I like to do the same to those reviews I read. If for some reason they're not the best reviews they should still be rated so those looking for info on a product can go by the average usefulness to know what reviews give the best advice.
I tend to rate the editor if I'm not going to rate the review. This is because I don't like rating really bad reviews, and unfortunately, a few people don't read their reviews, they just seem to post them. :/
What I have been doing is only voting when a review is very useful. I dont want to lower their rank if I just vote useful, and then I would feel obligated to leave a comment saying what I thought was lacking. If I am doing it wrong someone tell me.
I don't vote on unuseful reviews because I don't like to be ugly. Maybe they just need to learn and I don't want to discourage. If I see potential in a writer, I will give them some pointers in a nice way.
As someone still 'starting out' I like all types of feedback. I'd rather get an ugly mark and learn something than think I'm doing something right when I'm not.
I won't rate a review if it's incredibly heterocentric or if it ignores a huge portion of Eden's community or customer base. I've noticed that a lot of the trans community is left out in many, many reviews, and it annoys the hell out of me.