Star Trek IV: The Voyage Home (1986) – B-
Star Trek V: The Final Frontier (1989) – C+
These are the weakest original series Trek films, but I still like them both (IV more than V). I actually watched them because I wanted to make cut-list notes for a fanedit of V, and I just decided to watch IV along with it.
The Princess Bride (1988) – B++
A great, entertaining film. It never hurts to watch it again every once in a while.
EDIT: I’m gonna upgrade The Princess Bride to an A-.