Most importantly, the Dragon, Titan, and Stormreaver raids all have failure conditions where a player who attacks and damages something at the wrong time can fail your mission.
Queen Laliat has nothing like that (unless you talk to the queen before the others warp in), but it is a fairly simple question of killing Monster X with enough damage. The other 3 raids all have puzzle aspects where a player who can't hold back his DPS may ruin you.