Found a quick fix whilst truding about the net for solutions, worked for me and others. Worth giving a shot.
Enable the developers console in the options.
Open it up with the tilde key "~"
Now enter "mat_picmip 1" without quotes. This does a small thing to one of the detail settings I believe but it has stopped the constant crashing I was experiencing.
Worth giving a shot to get it running properly till a proper patch is released for it.