Too many.
EVILSPEAK (1981) was his best. And that's as good as it gets.
Or NIGHT TRAIN TO TERROR (1985) which is horrendous.
Most of his 176 credits are TV shows.
Just did a quick count and according to his acting credits he had 92 roles in movies. How many of those are bad I can’t say, but I have a feeling it’s a high percentage :)
As you mentioned he has also been in a lot of TV shows and even some video games.