Centurion
Super Freak
The first time I saw Frankenstein Meets The Wolf Man was on Super 8mm, projected onto my cousins wall. I was very young and this movie scared me.That's a great one!
There's plenty of stinkers on your list thus far though.
Yeah lots of bad ones, but I've always wanted to do a marathon of these movies.
The "Invisible" series is more comedic than horror. Each successive title in this line gets wackier and funnier. Honestly! The movie isn't even trying to be scary.