I love this game. The graphics are amazing and the variety of enemies is good. The game is designed in such a way that you are forced to replay earlier levels to unlock certain weapon upgrades - but as the levels are so beautifully rendered and so much fun to play that this is not an issue.
If you want to know what this game is similar to then think Devil May Cry 1 (which was a PS2 game) crossed with Tomb Raider 1.
I have read reviews of people saying that they had problems with the save system. I have not experienced this myself and I have not experienced any glitches (although I have not yet finished the game yet).
If you enjoy great graphics, unlocking cool new moves and weapons and button bashing mayhem then look no further and add this to your basket now!