Vampires in Skyrim recieve a boost to the power of their illussion spells making it seem that they should be masters of deception and subtlety. Again, appearences are decieving. There is nothing subtle about vampires in Skyrim who prefer using swords and axes to decapitate their prey rather than lull them into a false sense of calm.
If anything, the vampires of Skyrim would be better off if they were Werewolves since they exhibit the same finesse and subtlety as a diesel locomotive.