I'll add a +1 to the format. Concise and easy to take part of. My only constructive criticism is that I feel that some of those comics seem like one's that are already well known ones. When I look up webcomics myself I mostly want help finding the more obscure one's with smaller followings, the one's I might not be able to find myself. But that might not be why you started your review site in the first place of course and what you do with it is up to you.
I'd say one Review per week sounds good. That way you don't need to burnt yourself out either. And I'd find it worthwhile checking in about once a week to see if there's a cool new Review for me to look at. Especially with your bite size format. =)