I try to rate every review I read, but Often I have a lot of tabs open that I read offline so I can't vote on those ones.
I didn't know there was a way to know who had voted on mine, but had noticed some reviews that I felt were not even useful had been voted extremely useful by others.
The mentor program has been great for me as a brand new reviewer and often I'll comment to share my love of it with other new reviewers. I've sensed a feeling that people would rather not vote or comment than leave a low vote or critical response, which I can understand if it's a persons first few reviews, but wonder if it kind of throws things out of whack in the long run.