I have it from that AMD deal. I figured even though it and DmC are sort of mediocre according to most people I'd enjoy them for the usual 6-8 dumb AAA kind of experience that I don't get to these days much. At least Hitman is a stealth game, and DmC a character action game, things my library is short on.
,..so is it not a stealth game at all then?
It's most certainly a stealth game, even more of one than Blood Money, Contracts, or Silent Assassin if you go by the traditional definition. On higher difficulties, disguises typically don't get you too far because people of the same outfit will begin to see through your get up if you're anywhere in their immediate line of sight. You combat this with the instinct meter, which is severely limited on higher difficulties. It's decidedly different from Blood Money, where all you had to do was get a guard outfit and have free reign to do whatever you want without consequence.
It basically means on the harder difficulties, you play large chunks of it like one might play Splinter Cell: hiding, evading, and trying not to be seen.
On lower difficulty levels, detection isn't as fucked and instinct replenishes, so you can play it more like a Hitman game.