There's a trick to crash site. I think that you just need a team with good communication to guard all of the angles of attack at the crash site. You only need one or two people on the site. The problem is finding a team that will actually do this. Also, airstomps at the crash site are almost constant. While I like it, I think that it should be a suit module like in Crysis 2, otherwise there is hardly any way to survive at a crash site for too long.