As much as I love standard DM, I never played HL2DM.
On my laptop it was just jerky and unplayable. Fun, but unplayable. On my new desktop I fired it up once but either never found a server or ended up in one that was still very laggy.
Maybe I'll try it again. I remember doing significant running around in it on my laptop, and getting some kills, but it was at like 10 fps.
The fact that it was the SAME toilet is pretty hysterical.