Well, I payed ~$40 for it about 2 weeks after it came out.
Played it to death, went back to Morrowind then played it to death again.
Then I got bored and tried some community content to make it last longer.
That died out quickly.
I still feel like I got my moneys worth, but I still feel they could make it a lot better with some DLC packs or fleshing it out more instead of just making a sequel which I can pretty much garuntee is going to be similar gameplay plus a few new weapons, different characters, new maps, a new zombie clown uncommon infected and a new special infected.
But, still the same game underneath it all.
They could have included these new maps, weapons etc. as a massive DLC pack!
Or even more likely, an expansion pack.
Anyway, good luck to them.
I'm content for the moment playing Killing Floor which cost me $4 until it comes out.