I never understand this complaints.
Is she suppose to open a tomb every 5 minutes for the game to be called Tomb Raider? There is a story and a bunch of gameplay to be had before the reveal of the Tomb and its contents.
He puts it better than i did
It's not about whether she's actually in a tomb, it's about the gameplay that TR fans tend to associate with tombs and other ancient interiors: challenging platforming, puzzle-solving and exploration. Also about the atmosphere and mood: mysterious, quiet, solitary, adventurous... This had none of that.