If I had to rank the movies:
To start off, I love Last Crusade so much. There are so many great moments in it. The story is great, the cast is great (chemistry between Connery and Ford is amazing!), and it is much more of a humorous movie with a lot more action, but come on, Raiders is the one that started it all. Raiders is one of the greatest movies in cinematic history, and there's no denying it. The story, the characters, the amount of time and effort put into this masterpiece of a film. There was a point that I forgot the whole entire plot of Temple of Doom. A couple years back, I rewatched it, and I loved it. I loved TOD so much, I liked it better than Crusade. Now I realized that the storyline is kind of strange and dark. I definitely don't hate it, though. I still love it. The characters in this film are very compelling. Many people hate TOD because of Willie. While Willie may be VERY annoying, she's actually quite relatable to many people watching. It's not like every single woman that goes on an adventure with Indy will be fearless and tough like Marion, or mysterious and beautiful like Elsa. If Indy chose another random woman that has absolutely no archaeological experience to go on an adventure with him, they would most likely be very similar to what Willie was like. She also acted as a bit of a comic relief character. And Shorty, man. He's one of the most beloved characters in the franchise, and in my opinion, Indy's best sidekick that's not a love interest (sorry Sallah). These characters in this very dark setting balance the movie a bit from the darker tone.
And then there's Crystal Skull...
Well, admit it. Its still an Indiana Jones movie, just not a very good one. It could have been executed much better, and the aliens thing was a stretch. I liked the idea of Indy's son, but seriously? Lucasfilm casted Stanley Yelnats to play him?
Also, the CGI in that movie made the series feel so different, since moviemaking wasn't that advanced in the 80's. When I saw those CG monkeys, I swear, I forgot I was watching Indiana Jones. There's many strange things in Kingdom of the Crystal Skull, but we can't pretend it didn't exist. It's still one of the movies after all.
But yeah, that's just my opinion. I'll look through the comments to see what y'all think!