A bit late replying here, but I've only been playing the game for about 2 weeks.
My feeling about the game is that it's an action adventure (rather than point-and-click adventure) with entertaining and logical puzzles that even an adventure-game-loser like me can solve. If I had to compare it to other games (and that's difficult) I'd say the games that I've played that it 'feels' most like are Final Fantasy VII and VIII, but it takes itself far less seriously.
Not sure how far I am into the game (I've just reached The Hive) but I'm loving it so far. Every NPC has something to say. It's full of a humour that I like (Pythonesque and Hitch Hiker's Guide to the Galaxy type humour) and has had me chuckling and giggling a lot , and it's a long time since a game's done that. It's full of subtleties and cultural references, for example after the little episode with a Dr Jude, I realised it was referring to the subject of the Beatles song "Hey Jude".
To me the graphics hold up pretty well and, of course, you can max out the settings of your graphics drivers; I think the engine actually ignores most of them, but massive AA definitely works for me. The music is easily overlooked because it's often ambient, but what I've noticed of it (planet Sunder comes to mind) has been excellent. I'm finding it very immersive and, something I rarely do for long in games, I'm walking everywhere instead of running.
The characters are all interesting and it's full of hidden areas/items. There are also mini-games, which I usually dislike. The ones that are integral to the gameplay can be skipped, which is a GREAT idea, although you'll get a non-critical reward if you persevere and succeed.
Perhaps the most telling thing about the game for me is that it's taken over from Skyrim, which I'm finding tedious now that the "ooh, shiney!" aspect has worn off.
For the price, I don't think you can go wrong with at least giving this game a look.
Hmmm, I've ended up writing a mini-review...