Short (took me 12 hours, but I played on hard, replayed battles I liked a few times, and definitely took my time absorbing the atmosphere - most will get 8-10 hours out of it, I'd wager), but very fun & a FANTASTIC looking/sounding experience. And, I loved the story & setting!
Worth playing for anyone @ $30 or less, for sure. Just wait until you find a good deal on it. I guarantee this game will get a sequel, and that sequel will be much better received (they'll be able to flesh out the length, mechanics, and tie up the story better), so you'll have wanted to play this game by then!