I think I'm close to beating the game. From a FPS standpoint, it feels just right. However, the novelty began to wear off halfway through the game and it's starting to feel mundane. To be honest, the cutscenes were at times, more enjoyable than the actual gameplay. It feels kind of repetitive. Also, the storyline is kind of hard to believe (hero saving the entire world type thing).
That being said, I do like the alternate reality the game takes place in. It's interesting to read the little news clippings found everywhere.
I'll add more to my experience if anything changes when I finish the game.