I've actually been so disappointed by this that I haven't really been playing it much.
It is 100% the original game, which I like. "Remastered" is accurate in terms of the furthest extent of the scope of what they did. My wording in the preceeding sentence was selected very carefully, however.
Textures look great. 3D models look as they should. Soundtrack is solid. It just feels like something's not working right behind the scenes though - FX 8350 with a GTX 770 should not be stumbling while playing this while it can play much more demanding games effortlessly. Cutscenes don't appear to have been redone, so there are dramatic variations in quality between gameplay and cutscene (they cleaned up cutscenes, but I do not believe, not for a second, that they remade them - this is a problem because the original cutscenes were not smooth and neither are the "remastered" ones).
There is mysterious lag that comes and goes. The gameplay is right, but something isn't making it quite so great in places. I have to wonder if I'm the only one seeing these issues or if perhaps these were things the devs just gave up on in order to finally get a product released.
I'll try it on two other machines I have at my disposal (Mobile i7-2760QM with nVidia and a desktop A6), maybe it's a specific driver incompatibility. Maybe my expectations were too high? The re-texturing is great and credit must be given for what's been done, but it's not perfect in my eyes yet.