Free Willy, 1 was great, 2 was like ok they caught him again, but 3 was absolutely horrendous, for Willy to be caught on a safari in Africa has to one of the worst storylines ever.
1
Karate Kid
2
The Mighty Ducks D2 was sooo good, but 3 was just nowhere near the same level.
3
Home Alone
4
Preemptively adding Frozen to this list, because I know Disney too well.
5
The Addams Family. Family Values was great. The third one with almost none of the original cast? We don't talk about that one...
6
Jaws
7
Ice Age, probably could have stopped at 1.
8
POV: You are looking for people saying "Sam Raimi's Spider-Man."
9
Terminator
10
Robocop. I loved the first 2, but the third was garbage. I also didn't like the remake.
11
The Fast and the Furious franchise. I mean three was technically a spin-off that was alright and then it got even more silly with 4 and so on. But those first ones were great fun in their time and the first is actually quite a good movie and plot.
12
Shrek. There was just no way to beat Shrek 2.
13
Poltergeist Sure probably after 1, the second had moments, but after that it became a giant mess and Heather O' Rourke died.
14
The Hangover
15
Unpopular opinion: The Matrix. Honestly maybe even after 1.
16
Alien
17
Taken - Decent enough movie. Taken II - Ok, not bad. Taken 3 - Why? Why would anyone do this?
18
Superman with Christopher R
19
Pitch perfect
20
The sequel is not even out but Boss Baby.
21
The Mummy. The first two focused on ancient Egyptian history & mythology; number 3 suddenly takes place in Asia? Huh?! What franchise would add to this list? Let it all out in the comments!