I don't want to offend anyone on nationalism when I say this, but the lounges in India are not worth being called "Airport Lounge".
I have not used Centurion yet so cannot comment (but I saw the "not really" of another member here), but been to a few International Lounges outside India, most recently Sakura Lounge in Tokyo and another one in Hanoi (access through Axis Atlas).
And god damn, those are what Lounges should be about.
The Encalm and even Air India lounge on IGI, are more like small cafe with free food (can't even call them buffet) and people idling around as in Starbucks, without coffee ofcourse.
I stopped using/wasting time in lounges here, but I certainly always do await visiting one when travelling outside.
I just love my Axis Atlas for that, if nothing else. No kind of fee even for any guest (my wife), mentioning fee as I think Priority Pass charges some usage fee.