worth trying now that it's come down in price to a sensible amount. Don't get the Silver Star Edition.
Difficulty: Fairburn is squishy, enemies are not. Bullet ballistics are adjustable as well. On higher difficulties enemy AI gets unfair, making the game feel like a sprint. The enemy knows exactly where the player is and is just waiting for the first shot from the player before they allow themselves to move in and eliminate the player. I prefer to have full ballistics and low quality enemies, for a more realistic experience. 6/15, the adjustability counts for a lot, but it doesn't get over how quickly the game goes from fair to WTF, that was hard on default settings.
Lasting appeal: 7.5/15 it's worth playing through, and offers up a challenge (limited horde mode) mode. There's also a multiplayer mode, but I won't discuss that. A quality shooting experience. It's lack of features, it's not a mindless slaughter game, and altogether low ability to hold player attention that keeps this game from going higher.
Overall score: 6.7/15. Definitely not for everyone.