I voted 5 on Muffy.
The story was stupid. The sets and special effects (which they made such a big deal about) sucked. I think the castle, which must have been a filmed book cover, was the best of the fx. The actors/actresses had typical porno abilities - and were not that hot. They all looked way too old for their parts too. Of course, I can see not using real teens - that would be illegal - but these dudes were too old.
The only sex scenes I thought were decent were when Muffy buffed her boyfriend at the start and when she met up with the vampire queen at the end. Everything in-between was fast forward-able.
The story involved Muffy and her air head cheerleader pals searching out the neighborhood castle for vampires. Of course these undeads don't suck only blood...
There are better vampire porns out there.