All the Rockys after III I found awful.
I'm not going to claim it was a great movie but Rocky IV had probably the most memorable lines out of **all** the Rocky movies.
As for the topic... as for the topic you've got to go with a few of the horror movies.
Anything past Halloween II
Child's Play sequels
Jeepers Creepers 2
Howling (fill in the blank)
Anything past Nightmare
Anything past Friday the 13th Part III
Anything past Tremors