Before this site graduated, I had roughly 400 rep, and I'm sure I could review First Posts and Late Answers. In fact, I have the Custodian badge for both review types.
I then spent a few months "away", and when I came back the site had graduated. I noticed the "review" link I used to have had disappeared. I didn't think much of it, couldn't quite remember if I had really had it, until I noticed I had the Custodian badges. So I checked it out, and the rep needed is 500 (a rep which I have never achieved). This is in line with Stack Overflow, Super User, etc.
I can't find anywhere that states that the rep either was lower during the beta, or that it increased when the site graduated.
Are my assumptions right?