Raiders is my favorite, however I always viewed Temple of Doom and the Last Crusade as continuations of everything I loved about Raiders.
I loved the gloomy atmosphere of Temple of Doom:a human head blood of Kali cup, the stretched human skins on frames, the shrunken head on Mola Ram's headpiece, the skull rock placement of the stones with the cobra on top, with a very evil looking Kali with a necklace of skulls overlooking all. Very cool plus it had great moments with sight gags like the chilled monkey brain soup (when I was in school I actually made a monkey head bowl to eat from in pottery class), the thugee assassin hidden in the mural, and Indy's best side kick Short Round that brings out some humor in him like in the poker scene. Loved the bridge scene, mine carts, everything (well maybe Willie did get a little annoying).
I love the humor and the quest in the Last Crusade. I loved the beginning showing Indy growing up in my neck of the woods, I though River did an excellent job. I think Sean Connery as Henry Sr. was Perfect. I loved how it brought back some characters from Raiders like Sallah and Marcus and it felt like it was coming home. The action was perfect and I loved the Father and Son aspect of it because that is what the films always were for me anyways. I was introduced to the films by my dad and watched them in the theaters and at home with him. I always envisioned my dad as sort-of like Indy. I loved the locations, and the humor, no complaints at all for the film.
Kingdom of the Crystal Skull was fun to relive the magic. I think they waited too long for this sequel and everyone's expectations may have been too high. I enjoyed the pace of it and the idea behind it but I feel like it could have had more to it. I personally didn't like Mac who was supposed to be Indy's buddy who flip flops loyalty ever half hour. It didn't seem like there was enough depth to him to make his betrayals or his loss dramatic enough. Maybe if the film started with a prologue showing part of a mission with Indy, building his relationship a little could have made the character stronger. I think Shia did an excellent job as Indy's son. I loved the tough guy/scared kid aspect that he brought to the role. Overall the CGI didn't bother me however I was very disappointed in the monkey vine swing thing. It never bothered me when Johnny Weissmuller did it as Tarzan and I think it could have worked like in Raiders when Indy did it but they made it too hokey and not believable and why did the monkeys suddenly attack? I thought that was lame. I also felt maybe the cgi for the ants could have been handled better and did not like the ants swarming into the guys mouth and them pulling the other guy into the hill. I feel it could have been much more powerful if they had just been swarmed over and began thrashing around screaming with ants all over and then fell silent. If felt a little too much like the lame cgi in the Mummy Fraser film series (sorry if you are a fan). I didn't mind the alien visitors establishing primitive civilizations thing I just wish there would have been a little more left to the imagination to it, instead of the blatant in your face I would have preferred more mystery and a sense of the unknown left about it in the end.
Raiders though is my favorite with humor, the best action scenes, the best story, the spooky factor, the danger factor, the heroism, the best traps, and the best introduction to the awesome character that is Indiana Jones. I really liked how he is the tough guy but not invincible everyman kind of guy who has to use his wits and a little luck to scrape by. It has excitement, sadness, scariness, and above all filled to the brim with action.