Came here over X-mas weekend with the lady friend. If you want to dance or even walk around don't even think about it. The only way to do that is to get a table. As other yelpers have stated be careful walking down the stairs. When I was here SVD was playing a gig and we couldn't watch it on the main floor because there was a mosh pit of bodies blocking all paths.
We left after 1 hour because the place is not safe and a bad vibe. The one positive I will give Marquee is that the bouncers are very friendly and courteous. I was impressed with their cool demeanor and they were nothing like the typical meat head bouncer that push their weight around.
I think XS and Pure are better venues because they don't fill the club to fire hazard conditions.