Videos make it look a lot more like Splinter Cell than actually playing the game. It's not at all like SC really, except the one ability that mimics the tagging/executing of multiple targets, as seen in Conviction (and your not playing like a "real" Hitman if you're relying on that move).
It's different from other HItman games, but more like it's predecessors than a Splinter Cell game, and more in line with it's predecessors than Conviction was for the SC franchise.
"If we can hit that bulls-eye, the rest of the dominoes will fall like a house of cards. Checkmate"
It's the vibe I get when playing, I don't even bother with disguises anymore...seriously all I do is just hide behind cover...roll...roll some more till I get to the next loading screen. On levels with a target I still don't even bother with disguises because it is SO easy to have your cover blown so it just comes down to a lot of trial and error and reloading checkpoints...so I stay in the suit...get caught...reload till I get to the target and use the obvious option to take them out...easy silent assassin..
Granted, I haven't got too far into the story at all (I'm only on the third level, the one after Chinatown) but those people saying "Oh I don't even bother with disguises any more" are exaggerating hugely. It gets MUCH easier to get around if you're wearing a disguise, as there hasn't seemed to ever be a room in which you're required to cross filled with only 1 type of NPC and they're the only ones who are allowed there. Only in that situation would wearing a disguise not be beneficial.
EDIT: I should add, I went straight to playing on Expert as I didn't like the idea of moving up a difficulty and having to totally rethink my strategy due to some added guards.
BF3 Platoon for Skid Loader lovers - The Skid Loader Club: http://battlelog.battlefield.com/bf3/platoon/2832655241192792365/