I was obsessed with the original movie, watched it over & over lol...
However, my favorite(s) of the franchise are actually "At World's End" (its the most "at sea" of the franchise) & "Dead Men Tell No Tales" (it felt like first movie & 3rd movie mashed together). I actually prefer those two over the first *gasp* but "At World's End" has such an amazing soundtrack.
Dead Man's Chest was awful. I don't mind "On Stranger Tides", to me, it's better than the 2nd movie. It has re-watchability, unlike the 2nd film.