I saw all four Indy films in the theater.
I remember when I saw Raiders, my mother was trying to convince me that Indy was played by the same guy who played Han Solo. I didn't believe her. For some reason, I couldn't see the resemblance. (keep in mind, I was very young at the time!)
Temple Of Doom was my favorite when I saw it. I think I was 8 or 9 years old, which is the perfect age for that movie. I saw it several times, and thought it was hilarious, exciting, and everything that a good adventure movie should be. It doesn't appeal as much to me anymore, but I guess it's not supposed to.
I saw Last Crusade while I was in high school. I remember being disappointed with it. For me, it lacked the "edge of your seat" factor that Temple Of Doom had. It felt too bright and cheery, and some of the humor (such as Indy falling backwards down the stairs) just felt out of character. Over time, I've learned to like the film more, though.