I liked the game - The difficulty was constant for the most part, with a few spikes and a few situations that I kept having to retry due to some cheap mechanics(mainly involving rokkit launchers). 
The assault sequences were really a blast but had a few slight missteps where you end up missing a ledge and falling.
Overall I enjoyed the gameplay, the story was about par for the course but well done compared to others- it really fit in with the source material.

I would definitely play this, and would definitely play a sequel

(note this is only a review of single, as I havent tried MP yet)