I always found the DM experience in SS games to be pretty much unplayable. I'm sure the guy who posted below who still plays it would disagree, but compared to Quake3, which I was playing at the time, SS:DM stank. I had high hopes for them cracking the problems in the Second Encounter, but it was still the same sort of mess.
The crappy netcode didnt seem to matter in coop, which was excellent, as was the single player stuff.