I got this used as I was looking for a dark sci-fi shooter at a low price. General opinion seemed good so I bought it, and I must say I am very pleased with my choice.
Graphics are very good, in places amongst the best I have seen.
The main character's special weapon (the glaive) is cool and original, and its interaction with the environment was, for me, an awesome surprise.
Other weapons also very fun to sue, especially when fully upgraded.
The only "minor" negative aspect is the lack of a "story" around the main character; there are only a few "animated" breaks in the game that feel a bit fragmented.
AI is alright, but enemies and big bosses do not change much, althought I found some fights challenging and great to play. There are a few "puzzles" to solve that should also entertain (using the special weapon often is the key!).
Overall, I would say, it's definitely worth a buy (if price is reasonable) and I am sure most of you will enjoy playing it.