They had a free Dino D-day weekend on Steam a couple weeks ago, and despite really looking forward to the game, actually playing it was a bit disappointing.
That said, it was fun to play during that time, as it doesn't take itself seriously and offers a fun distraction to shooting at persons in most every other FPS. But it is regretful that one side gets the majority of dinosaur units. I wanted to play as dinos, not Generic-Source-Based-Shooter vs dinos.
I would still play it, if it was free. But I certainly wouldn't pay for it. Especially with the amount of other higher-polished, free mods out there.