I've never understood the love for the films after the first. Raiders of the Lost Ark is by far the best of the franchise. The tone changed after its success, going from comic book romp with some brutal moments to PG friendly comedy adventure with slapstick elements. Raiders is in my top 10 films of all time, and probably in the top 3 films I've watched the most times. I was obsessed with it when I was younger, but the sequels never captivated me in the same way at all.
I seem to be alone in this though, with many people citing Crusade as their favourite, it just blows my mind. As for Crystal skulls, at least everyone universally agrees that was a bad idea and I'm almost certain this one will be too.
Just like The Matrix, JAWS and Ghostbusters, there is only one good Indiana Jones film.
Come at me...