Completed the SP on hard.
Cons:
Way too many quick time events
Short even for my tastes
Character models during cut scenes aren't that impressive to be honest
When the game is dark(a lot of it is) it can be hard to know WTF is shooting you and it will draw out fire fights forcing you to pop up, see a flash light, duck back down, then pop up and spray that direction, repeat.
Pros:
Graphical power house on certain levels
Cool weapons
Variety in what you do throughout the game
Enjoyed the ending
Overall campaign is getting some serious knocks, and maybe it's that a LOT of it doesn't just feel liked CoD Modern Warfare, but is a straight rip off of CoD moments. Not a bad thing, but I can see why reviewers might be thinking the campaign lacks soul.