Difficult question really. I wouldnt say they ever have two many players in there as such, its normally about a 100 which is ok as while its cqb its still a big site.The problem is new players can struggle a bit trying to get around because they dont know the layout and how to play the site to its best. The other problem is if you get a lot of people camping in doorways and corridors it can create a lot of choke points and that can grind the game to a standstill. Its more a problem with players not throwing themselves in and not the site itself. The marshalls are usually quite good a coming up with games to prevent that though and nothing breaks a choke point better than the Terminator.
I love the place but I have a bit of an aggressive play style so it suits me.