Depending on how you decide to count X-Men movies, the fourth was either the good “First Class”, the excellent “Days of Future Past” or the bad “Origins: Wolverine”.
Conquest of the Planet of the Apes was quite decent.
I like Land of the Dead better than either Dawn of the Dead (original) or Day of the Dead (original), but that’s probably not a widely held opinion. The series as whole is interesting because each film explores a different set of themes and ideas related to the ZA.
I think Jaws IV beats Alien IV for worst ever #4.
Rocky IV is the best #4 I can think of.
Was that the one where Jason got kicked in the nuts by a chick? Or was that the third one?