In the "important" post in the website reviews forum is written: "We will endeavour to deal with your request within 72 hours."
I checked some of the threads there, and while some of them seem to apear the same day, some others take 10 days+ (I compared the initial post date and the first reply date, i guess thats quite reliable?).
While this is ok for personal sites, if you need a review for a commercial site, were you have schedule and deadlines, waiting for so long renders this feature much less helpful.
I understand that all the work is done by volunteers, so I am not saying that they should work more or anything. But maybe the whole system needs to change.
Sure, threads now get a bunch of reviews, but more than 2/3 of them say nothing useful, many times they just agree with what people above said without adding anything new.
I believe this review exchange should be done in a "free market" way rather than a controled one. People in the forums know each other, so I will know if memeber "X" is giving good helpful reviews, so when he post a site for review I will reply, knowing that if my review was helpful enough he will review my site when i need it also. Maybe you can PM the members that gave you a helpful review with something like "Thanks, PM me if you ever need a review from me" so the member can "pay back" even if he is not browsing the particular forum at that time.
To new members we can be more flexible, but also suggest that if they want more replies they should give quality reviews to others.
I believe that this way we will be able to get feedback faster and of higher quality (which metters more than quantity).