I don't necessarily LOVE KOTCS either, but I get it. I get what Lucas and Spielberg intended - It's an homage to the b-movies of the era it takes place in, the 1950s... just as the originals (especially Raiders) are homages to the b-movies of the 30s. Think about it: In the 30's, the b-movies/Saturday matinee serials were things like Zorro, King Solomon's Mines, etc. In the 50s, the b-movies/Saturday serials were UFO/Alien films. AND, nuclear warfare was on EVERYONE'S mind. Heck, even the harsh, artificial lighting of the opening scene at the hanger is reminiscent of some of the work done in those 50s b-movies.
The other 3 have their fair share of corny scenes too. The mine car chase? Really, how feasible is it that the mine car Indy and company were in could jump a huge gap in the tracks, and land back on the track? The biplane scene in Last Crusade drives me crazy... couldn't they at least turn on a fan to have some wind blowing their hats? And honestly... Indy rode on top of a submarine to the secret Nazi island? Each film has it's own "flying refrigerators".
Does KOTCS feel like the other three, especially Raiders? Of course not. Did I enjoy Shia? Heck no. Did I LOVE seeing Harrison back in the jacket and fedora? Abso-freakin'-lutely. And if he does it again, I'll see it too. And I'd be willing to bet nearly everyone who is a fan of the originals will, too.