Agree with everything said here. Also, there are ways to "protect" against vampire break ins, with garlic and advancing the vampire lore skill, but if you don't wanna do that you can also just lock your front door at night and that works just as well ;-P I think it's more fun if you actually play with vampires, but just interacting can be nifty too. It can be pretty cool to just play chess with Vlad or go dancing with Caleb Vatore. Of course, sometimes vampires are dumb and go out during the day and burn up and die, which can put a crimp in your plans cause now your sim is sad from witnessing a death. But that's probably the biggest inconvenience, and I've been noticing less of that lately so that might have fixed it in a patch.