Being over the top is a unique characteristic of the Indian Cinema. If I wanted to watch "believable action scenes", I'd go watch a documentary. I honestly don't get this idea of standardizing everything as the West does. It's a great idea for some. For art? Come on.
I'm sorry, but the top US movies any better? Between Star Wars and Avengers, there's not much left in the way of believability. It's better when they don't take themselves as seriously.