This is one of the rare games that rises up to it's hype , IMHO.
even before the purchase , i watched like , tons of gameplay videos on youtube , and i was hardly waiting to get it .
The best part of this game , is the Co-op. Both characters are equally matched , and the best part of it , when a new puzzle occurs , each of the players offers a solution , many times the players offer a different one. And my ,are they cleverly made.
The storyline is not something extraordinary , but the main stimulation comes (mostly) from the challenge of the puzzles , not the story progress , neither the action sequences (since most the enemies do not vary a lot).
Besides, the possibility of changing players Totec -> Lara and vice versa , after the first run-though really boosts up the replay value.
On a side-note : I played this one with my girlfriend , and it was the most romantic weekend EVAH :)