This new glitch is a great way for doing Crawmerax now:
(credit to EpicNNG for finding it)
The idea is you get into that spot and then pick off all his front facing crit points. The tricky bit is the back one, as you won't be able to hit it from this spot.
What I did was started a game by myself, made it public, got into this spot and picked off his arms & eye. To get the back spot I had 3 other people join. Once they came into the game and went to the top of the elevator they ran to the back side which caused Crawmerax to turn revealing his back crit spot which I then unloaded on finishing him off.
All in all took like 10-15 minutes.