one thing that bothered me about this!
I really disliked that all the levels were like inter wined so that you'd end up going backwards to bits you've already done time and time again looking for clues!
I preferred the old method of levels being separate like in tomb raiders 1-3 because, if i was sitting in the house bored and say fancied playing around on the quad bike, I'd know exactly what level it was on because you could replay them. The old method meant you could load up certain parts of the game, depending on what you were in the mood for.