I had my screen play on the site for 4 weeks with 1 review and 11 reads. I found out quickly that the old timers on the site only review their buddies and kept their tiny clique in the highly read and reviewed pile. I would pass on this site.
Zoetrope strikes me as a place where you only get out a piece of what you put into it. So if you aren't putting much of anything in it you aren't going to see anything out of it.
I could be wrong though.