HL?DM sucks at the moment anyway, I just tried it.
The GUI's all trashed, the physics are even jerkier than CS:S, you don't get the good ol' crowbar, there are only two maps, and everybody starts with grenades and an SMG (which makes it rather boring).
Then again, Steam does give VALVe an excuse to release crappy unfinished software 'cos they can then patch it whenever they feel like it.