I recently finished this game. It started off really slow, but I think this is done to get the new player used to the game. It picks up alot after the first level.
The purpose of the game is to use guns and swords to keep the world safe from the plans of the Nazis. Oh, yeah, you are a female vampire that wears skin-tight clothes. Not a real original idea, and the gameplay feels like tons of other games out there. The story is pretty thin.
Something I found irritating about the game is the dialogue. Some of the things said by the main character are pretty assinine. I found it hard to beleive that more thought wasn't put into dialogue for the cut-scenes.
I did get enjoyment out of the game. I wish more time had been spent to make the game better. I wouldn't recommend this game since there are others out there of higher quality you can spend your money on. However, if you found it at reduced price (like I did) you might want to grab it.