I didn't really have a good experience at Marquee but that has a little to do with the fact that I was completely sober and the company I was with as well.
We were on the guestlist for Marquee so my friend and I rushed to get ready to go to the Cosmopolitan where Marquee is located. Because of this, we didn't have any time to pregame at all. But honestly, with such long lines, even if we did have time, the buzz would have worn off long before we get in.
So, even though I was told being on the guest list, you skip the line and cover before 11, the guest list line was crazy long. We lucked out because when I went to ask the bouncer how long the wait would be and what not, the party in front of us apparently didn't have an even boy-girl ratio so they asked if we wanted to join them to go in and go our separate ways from there. So we did that. They were hotel guests so their line was a lot shorter than ours but we still had to wait a good hour before getting in and they were each only able to bring in one girl (one of the guys in their party digged out) so I let my friend go in for free and I just paid the $20.
Once inside, it was super packed so my friend got really annoyed and wanted to leave after 10 minutes. I really want to try visiting Marquee again someday with other friends (a bigger group next time since everyone decided against joining us).
It's pretty cool though if you don't mind crowds and lines and if you're in the mood for clubbing. There's 3 floors but the top floor is a little boring. One floor is for house and trance music while the other one plays hip hop. The floor with the house music is where the party's at though.