Really enjoying the game so far. It's been a really satisfying experience. Im mid way through the single player campaign and im gonna stop and start playing the co-op. I played some of the deniable ops last night with a partner and it was a blast(altho the dude had no mic, so that hurt the experience a bit). But there is something to be said when 2 spies drop 2 mercs, hand to hand, simultaneously.
For those worried the game is just a run n gun, i think you can rest easy. It's definitely more action heavy, i think iv killed more ppl in the 4 hours iv played than i did all through PT and CT, but i still found myself waiting for that perfect opportunity to strike from the shadows, just like in the old Splinter Cell titles.
The few gripes i have are small ones, the attention to detail isn't as nice as id like, for instance Sam never 'holsters' his pistol, it kinda just disappears when you put it away, i also dont like that you auto equip secondary weapons if you dont already have one, i dont like that you cant remove upgrades and im not crazy about the black and white hue when you are in shadows. Considering you stick primarily in dark areas, the majority of the game is played in black and white.
Other than those few things, im loving the game. The deniable ops are an absolute blast and a lot tougher than i had thought. Cant wait to play more later.