Even if the single player sucks, the versus mode looks like it should be great. Considering all the time I've put into
CZ/
HL/
HL2/HL2DM/
TF2 I doubt Valve would dissappoint. I mostly want to get other people excited so I have people to play with. It'll be just like any other game where it's amazing the first few days (ideally) great for 2 weeks or so, good for a month but you know and accept most of the negatives, and okay after that but you keep playing for the multiplayer cause friends are where it's at

(and that usually keeps the game around "good" level unless they seriously fuck it up.)
Everyone should at least try out the free demo on the 11th-17th though, I'm just glad I'll know if I like it early. If nothing else it was only $50 and I rarely buy games so *shrug* I'll let everyone here know when I get a chance to actually play it. I'll probably try to install it on my 2nd comp so Cloudsgirl and I can play together offline on the same account and get the coop experience going a few days early.