I enjoyed Indy 4.
Though most people disagree, Cate Blanchett was the weak link for me. It was great to see Karen Allen back in the series, and John Hurt was having a whale of a time in the dimwitted prof role.
IMHO the unsung hero of the movie was DoP Januscz Kaminski. Some of the shots were quite superb: in the opening scenes, look at the reflections on the hubs of the vehicles, and how he positions the cameras to get the "money shots" in the action sequences. The man knows his stuff. But DoP's rarely, if ever, get the credit they deserve.