Army of Two is crap. Why? It has issues up the wazzo. Good concept, except it was done recently and much better. It can be a fun game for short periods of time; so $30 would be the right price for it.
Turok is crap. Why? Play it. I dig dino's and the archer power is fresh. End positives. It's really to bad as I was really looking forward to this game. Co-Op through the entire single player game might have saved it, it certainly wouldn't have hurt.
Most games ARE fun and worthy of your money. I suggest rent before you buy.