Well, I ended up seeing it anyway. Fan reaction to the long-delayed fourth Indiana Jones movie was very divided. Some accepted the sillier elements for what they were and enjoyed where it stayed close to the spirit of the original movies, and others hated it for the outlandish plot tarnishing the integrity of what they forget was always a pretty goofy series. There were a few moments that deserve questioning, but overall it wasn't too far out of line. There was some unnecessary usage of computer graphics on small animals in multiple scenes, which was intended for comic effect but never that funny, and stuck out in a movie that usually tried to avoid effects that take you out of it. There was a scene near the beginning with a refrigerator that was completely moronic and utterly pointless, and I can't think of why they thought it was a good idea, but that was the only thing that really bothered me.
It helps that it's modern and benefits from current technology and stunt techniques, but the action sequences are the most exciting in the series. There are some pretty good ones in the other movies, but to me they were more about the character than a car chase or whatever. There aren't as many of those character moments, but there are some pretty good ones, and they acknowledge his advanced age without making a big joke out of it. The addition of Shia LaBeouf as heir apparent shifts the dynamic and it's interesting to see Indy as more of a mentor instead of just a leader. Harrison Ford isn't the young buck he was twenty years ago, but he really didn't seem out of place in the role. He doesn't dish it out as well as he used to but he can still take it pretty good, and his intelligence when it's required still make him quite a compelling protagonist. The main plot twist and especially the resolution were pretty out there, but I liked the movie all the same and wouldn't mind if they decided to make another. I was skeptical of the idea at first but they pulled it off fairly well.