I re-watched the first three Indiana Jones films. They're still great fun, and I find that my overall ratings of them haven't changed at all.

Raiders of the Lost Ark - 4.5 out of 5 stars
Indiana Jones and the Temple of Doom - 4 out of 5 stars
Indiana Jones and the Last Crusade - 3.5 out of 5 stars

That's right, I rate Temple of Doom higher than Last Crusade. Temple of Doom is the underrated film in the series. It's not quite as good as Raiders, but in many ways it's the truest to the spirit of the old movie serials that inspired the Indiana Jones series in the first place. Those serials were basically exploitation films, and Temple of Doom gets that in a big way.