Most of the OG Mad Max movies are good/solid (although Thunderdome was good in a campy sort of way), but Fury Road is just fucking incredible.
A Quiet Place was really solid
People love Children of Men, I thought it was just OK.
Terminator: Salvation, not the best in the Terminator series, but I'd argue it at #2.
I Am Legend wasn't terrible, was pretty entertaining
28 Days Later was good, Cillian Murphy has creepy eyes
It Comes at Night was a little bit of a letdown IMO, but it was still solid
10 Cloverfield Lane. Fight me, I like the whole Cloverfield series, even the new one wasn't SUPER bad (although it was kinda bad
)
Here are a few that I wouldn't consider post-apocalyptic, but futuristic with stressed futures, that I enjoy
Fifth Element, one of my all time favorites
Blade Runner and Blade Runner 2049
Dredd (so fucking good)
Take Shelter (Michael Shannon, Jessica Chastain, Shea Whigham, very tense and very good movie)
Comedic post-apoc
Idiocracy
Zombieland
Shaun of the Dead
Animated post-apoc
Wall-E - it's a kids movie, but it's stupendous
Akira - the benchmark for anime movies IMO
Evangelion - favorite anime series