I'm with both Redneck and Infection.
I completely agree that since they promised DLC for L4D, they should honor that agreement.
However, since they're obviously not going to....
I LOVE L4D and L4D2. They are, bar none, my favorite video games EVER. I mean seriously, we've been playing these almost every night for over a year. My love for the games far outweighs my frustration that Valve didn't follow through on their promise. They're too much fun to not play and enjoy.