30 dollars is too much for a lukewarm game with not enough replayable features to warrant $60, much less 30. It's a freaking launch game just about, it should be well past the point of being $20. It's a dead IP also, because Ninja Theory decided to go multi-platform and not just do PS3 games and although Sony owns the IP, you think they are going to even touch it with all else they have? Not a chance.
Nice game, but give it time and you'll be able to pick it up for about $15 or less like you can now.