I just finished the game and have to say.
The single player story mode is awesome. Intriguing, interesting, it does draw you in.
Haven't tried the multiplayer mode, only found a couple bugs throughout the gameplay, so not too bad.
Although, so far it seams the end game is frusturating. To me it looks like it takes too much time and the missions do get more and more repetitive, same locations, same enemies, not too much to explore or new to see, so the only downside I see.
Either way. For the single player story - worth it.

UPDATE Review: Even tho' I had goods to say about the story, ♥♥♥♥♥♥♥♥ the endgame grindy part is a hustle. And It's not an enjoyable one, everything is so so repetitive