Thanks guys for the recommendations, though they don't really fit my needs.
What I am looking for is not a site where experts will tell me whether my idea is good or wrong, but whether I deliver it in a suitable/attractive way or not. In essence, it's more about form than content.
ThePitch.co sounds like that but from what I've seen, it's mostly just a platform where you submit your idea as text and people tell you whether they think it's a good idea or not.
I talked to a friend of mine who is actually just building something like this at http://www.oneperfectpitch.com/#!pitchingbooth/c1xyl but I was wondering if there was similar platforms already available (I have that need for myself after badly screwing up a pro video shoot I got for free, but I had slight reservations wrt the pricing of her service).
@VS: I unfortunately don't know who Rick is...