Finished the campaign, and outside of being a graphical show piece it was wholly forgettable.
I actually kinda liked the story concept, even if it was thematically the exact same hook you see in every single modern war story (especially video games). For what it was though it had some promise, keeping it simple and block bustery. But, as with all these games, it failed by taking itself too seriously and trying to build meaningful characters without ever giving them enough screen time, or simply failing to understand the nature of the interactive medium.
Mechanically I echo the same as people saying the middle levels are better, which I think they are. They flow a bit better, have better set pieces and shoot outs. That being said, 90% of the game felt extremely scripted and rigid, even moreso than most games of this ilk, with almost zero effort required on the player to progress. Enemy encounters, shoot outs, pacing and everything else based around building an interactive experience is so half arsed, and blatantly takes absolute second place to scripted, cinematic and beautiful set pieces. This wasn't made to be a video game, it was made to be a movie.
Not that I expected anything else, but outside of showing buddies some of the more impressive graphical show pieces I probably wont ever play the campaign ever again.
Now, back to multiplayer!