I really like the site design, and the little touch with the Moon Index.

The reviews though are not very critical at all but seem to rather be a regurgitation of the site's own promotion materials.

I don't think that is necessarily the best way to go about it. You want to be positioned as an impartial opinion giver that actually rates sites based on merits and drawbacks instead of giving off the impression that you are purely doing this for the affiliate money, and only talk about the positives of each site.