So I just finished it. I was on the last mission as I typed that previous message. The game was without doubt, very good, but definitely fell short of excellence.
There are moments early that offer lots of stealth options, and the first half of the game finds a great balance between stealth and action. Unfortunately, the last half felt far more third-person action. Don't get me wrong, it was still good fun, but I felt it was easier to raise hell than sneak from the shadows.
Overall the storytelling was good, and the soundtrack was just top notch.
Good solid game, but I'd still rank it below the first splinter cell, and Chaos Theory.