Indian culture is not overrated. It’s simply been represented in some distasteful ways in a few movies that have become rather popular. The Indian culture is as full of nuance and tradition as the British or American cultures are. Many of the things that Indian people may see as overrated - such as a specific tradition they may not understand - are considered interesting and worth learning about by other cultures. However, that learning has to happen in the right kind of way, but that’s for another question.
Regardless of what makes you think Indian culture is overrated, it all comes down to your view and what you think is important. It also comes down to whether or not you were raised with that culture. For example, I find the American wedding tradition of bridesmaids to be a bit overrated, but I was raised with it.