My main problems with that movie are this...
The story didn't make shit for sense.
You couldn't tell the difference between the vampires and werewolves, because they all wore the same exact clothes.
You really didn't know shit about either side, and I still don't know who I was supposed to want to win.
Vampires and werewolves should not need guns to fight eachother.
The vampires had one special power... The ability to jump off high things.
The werewolves looked like a cross between a dog, and the alien from Aliens. Werewolves aren't slimy, last I checked.
The list goes on and on.
::shrug::