There first half of the game is kind of boring and repetitive, with the story there to keep you going. It starts to drag when all the environments are just forest with the occasional old timey building sprinkled in. But at pretty much exactly the halfway point it starts being interesting again. Story, setting, and difficulty all ramp up and it's fun again. I would say try it, it's not awful, just a bit dated.
First DLC was ok, and the second was great.