Splinter Cell is probably my favorite game of the year and most disappointing game of the year at the same time. During most of the game, it's all pretty much stealth, and I loved it. It had a MGS4 mixed with Arkham Asylum feel to it. The shooting with the pistol was super satisfying and racking up headshots was a blast. (For the record, I disagree with Jeff Gerstmann. Headshots are just fun.)
But towards the last hour or so of the game, the developers say to me "Alright now, fuck you. Let's take everything you love from this out of the game. Now...shoot everyone. With a pistol. GO!" I almost quit playing the game near the end, and I actually recommend you do so. When you get to the part where you have to locate generators, turn the game off. You've seen what you needed to see from the game.
I haven't really explored the other modes other than Deniable Ops which I played briefly, but that seems more of a thing that I would do co-op with someone. And unfortunately for me, I have no friends who would like to play with me nor do I have Xbox Live Gold. I'm a loser, I know.
Over all, I was about ready to call Splinter Cell my favorite game of the year so far, until the last hours pissed the hell out of me. Now I think it's just an average game. They just got way too sloppy at the end and didn't add any stealth elements, which completely ruined the game for me.