It's about 7.5 hours long, but at $5 that hardly should matter. I really enjoyed the story and the world. The unique weapons were fun to use and the combat was tight and reactive, if not a complete reinvention of the genre as some seemed to demand.
The only real downside to me is the actual lycan shootouts. It's obvious that area of the combat never came together, but there's only a couple sequences of that and they're brief enough. I had no regrets paying full price, and consider it a steal at $5.
The game is moody, and deliberate in its pacing, though, so anyone who hated the "walking simulator" portions of Uncharted 4 will probably be annoyed by The Order. Much of the joy for me was drinking in these fabulous environments, though.