Tried it and not that impressed. Controls are quite hard for battling with raptors. It's hard to tell if the raptors are dead or not, especially with player being able to push the ragdolls around. And, quite unusual complaint - AI for larger dinosaur (the one that attacks raptors and then player and his teammate) is too advanced, or what is more dumb prefers human target to bot. For me it ignored my teammate who stood in the open firing at it with shotgun, and went for me, even though I was farther, in the corner and significantly to the side from it, and I was not shooting.
Game isnt even out and its being completely judged entirely on a demo as if that was the final thing.
Still, it's a demo that is supposed to sell the game. This demo will remain on Live for quite a long time, and also, since the game is scheduled to be released in first half of February, that means that it will go gold in the next few days, since all the printing, packaging, shipping takes 1,5-3 weeks depending on the publisher. To summarize, this demo mostly represents the game. Also I didn't noticed "demo does not represent quality of the final product" or alike warning at the start of the game.