There are many things that seem to take off when they're started and die very quickly as people get bored of it. So I think if, after a month or two, things are still going then a subforum may be worth it. Otherwise, why bother when the idea may die in a week or two?
Besides, the idea of posting a thread instead of doing a separate blog was to make it so people didn't have to go out of their way to see it. If the thread is in GAMV then my hope was people would go 'Oh, a new review, I'll read that and join in'. OTOH if it's a subforum, then the only people who will read it are the ones who actively seek it out. There's no chance someone will randomly see a review and join in on a whim. Which eliminates entirely the reason I pushed for doing this on the forums instead of a blog when FC and I were talking about it.
Or, to put it another way, the recommended amv forum got a lot of use when it started. When's the last time you posted in it, or even looked in it, though?
Of course, it's not my call. The admin/mods will decide. I just think they should leave it in GAMV, at least long enough to see if it's a fad that will die out or if it's something that has enough people interested that it could survive in a subforum.
Also, one last thing, while it's not in the rules I think there should be a limit to how often a new thread is posted. I have a review written up, and have for a week now. I don't want to flood reviews all over the place though, so I will not post it yet. When I see it's been a few days with no activity on any review threads, then I'll post. Now like I said, this isn't a rule, and I don't expect anyone else to follow it. If anything, I'm glad that 4 of the 5 review threads were started by different people (and that 5th was inspired by someone else, so effectively each review thread was done by a different person really). I'm just saying, I'm gonna pace myself some.
Correction, 5 of the 6 review threads were started by different people, and that 6th was actually FC reacting in response to someone else who started it. Which makes me kinda happy there seems to be a variety of people interested in the idea.