Certain themes worked in the '70s and '80s. But they seem completely out of place in today's times. You can't connect with them, plain and simple. That's the issue with Kisse Pyaar Karoon?.
Kisse Pyaar Karoon? uses every rule in the book to entertain the viewer. It borrows heavily from all masala films that one has watched and admired over the years. To give the credit where it's due, a few scenes are indeed funny. But it comes too late in the day. Ideally, it should've released a couple of years ago.