This is a good game but....
Let me explain: with this game you have all the ingredients to have a super game, but IMO it lacks passion and soul. Graphically looks OK, but the graphic engine is an old one: the Unreal 2.5, the same of Chaos Theory!!!, tweaked of course (you can see the logo on the credits). So in HD, the resolution is not the same of Oblivion, or GRAW (same developers). Everyone is talking about the "great graphics of SC", but is not true. The frame rate in some chapters has problems, and some times run below 30fps. You have a lot of scree tearing too. Just move the camera in chapter 2.
The best part of graphics is the Fischer´s bald. That is a true next-gen scalp. In some close-ups you can see his face sweating. But the rest of the environments dont have the feeling of next-gen. Some chapters look better than others (Shangai).
The story is not the BIG story, and some decisions you need to take in the game aren´t very importants at the end on the game plot. It is a standard script. Every chapter feels separate from the others.
This is not an easy game, specially if you want to have a high stealth %. But if you want you can play this game as a FPS killing everyone and receiving a -230% of stealth (seriously). Few weapons, few unlockables, and the gadgets dont feel useful. Sound is mediocre. You cant hear well the instructions that the central HQ gives to Sam
The fun factor is around 8, because despite the weak points every level is challenging enough to keep you playing. SC series needed this time a new blood, some refreshing stuff on sole mode, but IMO Ubisoft worked this game in a very conservative way, avoiding a revolution of the genre.
Multiplayer has some new things, and playing spies against mercs is fun.
Sometimes you will find lag issues, and host problems, but you probably will return more to the multiplayer than to improve your stealth % in solo mode.
SC:DA is a solid game that will maintain you playing it for hours... until GoW, FEAR, and CoD3 could show us a "true gen experience", in gameplay, multiplayer and graphics (i hope that).