To be fair, is it any more silly than....ghosts?
....or glowing rocks?
....or a 700 year old knight, alive and well?
I think, and I will go out on a limb here and suggest that this Indy movie is probably the closest to George's original vision of the character, and the wildly 'out-there' escapades the character would get embroiled in
No doubt Raiders is the best of the lot (and one of the best films of all time) but I can't help feel the uber-fantastic premise, was what Lucas has always had in mind for Indy, and this film had the technology to do it