Not only the best Lara Adventure, but possibly the best adventure-puzzle-platformer in general. There are things one can criticise: the reduced difficulty (comparing to TR:A), further simplification (you can carry all the guns, but there are no ammo drops, for example), too many secrets to really go 100% without a walkthrough, considerably shorter playtime to the preceding two. But what it gets right, it nails: a better, gripping, story than half of the Indiana Jones films, and the atmosphere of discovery.
Greatly improved graphics allow for lush vegetation, and a large part of the game happens in overgrown, South East Asian temples, modeled after Angkor Wat and similar. Lara gets new moves, which add little to the game play, but increase immersion. Both platforming and puzzles seem completly natural, and while the path is completely linear, the levels do not have a contrived feel of a platformer game, requiring no suspension of disbelief - at least in terms of levels, you still need to swallow the usual supernatural and ancient super advanced civilisation stuff, but that's par course of this genre). While some levels in Legend come close, here you really feel like you are exploring something, if not real, then at least believable, rather than playing a platforming game.
I won't spoil the story, but while it rounds up nicely both Legend and Anniversary. it can be experienced completly on its own, if you prefer to start familiarizing yourself with the best title. It pays to read Lara's journal, as its entries tie everything she encounters to existing (mostly Norse) mythology. The levels also follow each other more naturally, without that world hopping for the sake of it feel which is typical to all Lara's (and Henry Jones's) adventures.
It doesn't have the best puzzles, platforming, combat or story of all times, but it's one of the best gaming experiences I had, competing with adventure films on their own terms, while being an engrossing game to boot.