Trajhenkhetlive: Can't say I'm a fan of the 4th Indy film. The over the top sequences came into the story in such a manner to make the story seem unbelievable. Like when Indy hides in a fridge and it protects him from an atomic explosion or the whole beginning action part in warehouse of secret things. The way things play out it's almost like watching a road runner cartoon. Also the whole semi sentient animal thing was a bit much. There are also a lot of Deus Ex Machina moments in the film (one that was real galvanizing was the monky's helping out Shia's character).
To be clear, this stuff could have worked but it probably needed better presentation or the tone of the film should have been in line with what came before. Save the over the top stuff for the big reveal.
It's made to feel like a 1950s film and how we think they are. Even the main plot is in line with that era thinking. In this regard it's actually a very well made film and a lot of thought have gone into it.
The problem is as I said that the characters of Indiana Jones, Marion and so on is from a different era and do not fit. If Lucas had come up with totally new characters, as in it not being a Indiana Jones film it might even have been a hit.
Here's a Star Wars example. Imagine if Star Wars I, II and III had been Flash Gordon I, II and III. Then they would have been great.