I just saw Indiana Jones 4. It wasn't great, but I didn't hate it!
It probably helped that I was never an Indiana Jones fan to begin with. (No childhood to rape!) It also helps to prepare yourself for wildly implausible shenanigans, inanities and tomfoolery.
I did go in expecting some good old-fashioned movie magic, since I read this on IMDB: "Producer Frank Marshall stated that the film would be shot the same way as the previous three - with stunt men, and using CGI only when necessary." Sadly, the only old-fashioned movie magic I got was that there were actors filmed by a camera. I think that, sooner or later, someone's going to make a movie like this without digital effects, and people are gonna go nuts.
All in all, it's a solid C. Or, if you like, a "meh."