5 year olds didn't mind at all
My twin 5 year old girls didn't seem to think this was too scary. They aren't the most daring either; they were still talking about the Grinch in March. We are pretty tight on what they watch and are exposed to and other than the less-than-Pixar animation quality, nothing seemed bad. The mentioning of the Saw movies is a total farce. Dracula says "chainsaw movies" so quickly, I don't think anyone would've noticed it. I only did because I was looking out for it, I had to go back later and make sure that's what another reviewer said. It was never over the top scary, there was a positive message. Throw your tv out if you don't want them exposed to anything remotely negative. Most stories have conflict in them, so we have a resolution. It's a part of life. It's a Halloween movie with Dracula in the title, I don't know exactly what you're expecting. Rent Noah's Arc if you're looking for something a little more wholesome. SPOILER ALERT - Earth is flooded and some animals were probably...KILLED.
As far as the bullying thing goes, it's nothing too extreme and you can TALK TO YOUR CHILDREN! Don't let the tv be the only influence on them. If they're over 5, they can probably understand reason and emotion. Take responsibility for raising your kids.