Took about 45 minutes for Steam to sort itself out last night (I kept having to close it and reopen it, cause it would keep making it to various points of working but usually fail.)
Once i got in, i had a couple of issues getting into a game (first one got into the lobby, got 4 people, started loading the game and then got kicked back to the main menu JUST as the game said it was loaded)..
FINALLY got going and played through the shopping mall campaign (think it's called "Dead Center"?)
To say that this game is an improvement in everyway possible over it's predecessor (which i loved) is an understatement. The melee weapons are just incredible.
I picked up a ninja sword and just waded into the horde and OMIGAWD was it awesome. I was the frickin' Master Ninja, taking out any special infected that came along with gusto and style.
Absolutely love this game, so far. Love it.