I think quite a few people here haven't seen the first three films for a while, and have got some selective amnesia.
I watched all three in the week before I watched the fourth, and in fact I found the new film very much in keeping with the first three.
I'm not going to dissect every scene in detail, but to me they didn't try to make an Indy film for the 21st century, which I was very relieved about. The action scenes were very much like in the first three, and choreographed very well. There was, of course, the occurrence of Indy's snake phobia (which I actually thought was a very funny scene), the spooky and booby-trapped locations, the tribal elements ... all the things that make up a good old-fashioned Indy adventure.
There were some nice noRAB to the previous films, and it was good to see that Indy had, in some ways, become his dad. There was a great moment when Shia LaBeouf's character did something outrageous, laughed and looked at a distinctly unimpressed Indy; it perfectly reflected a scene in Last Crusade when Indy did a similarly outrageous stunt and looked at a thoroughly unimpressed Sean Connery.
I confess that I didn't dislike the fridge scene, though it was patently ludicrous, on a scale not seen in any of the previous films. Perhaps it was a mistake to have it in there, but it was fun nonetheless.
For me, the only gripe was the ending (which I won't give away here). The Indy films have always had something mystical about them, and that's absolutely fine, but for me, it didn't quite gel with the overall Indy mythology.
Plenty of people here have commented about realism, and the fact that Indy would have been dead several times over during the course of the film. Well, I don't actually take that as valid criticism of the fourth film specifically, since it's very much in keeping with the first three. Ifyou want to criticise unrealistic action sequences, then make your comments about the series as a whole. But if you're a fan of the first three, you shouldn't really be going to see an Indiana Jones film and expecting gritty realism. It's an old-fashioned, escapist action-adventure film - since when were they realistic?
Personally, I found it a worthwhile addition to the series and I kind of hope they'll make another, though it seems unlikely.