Ok since this is the talk of the town, I don't want to miss out on the network traffic.
This is what I've got to say about this movie.
I'm no expert in analyzing movies, I like almost all movies as long as the print is good(damn the cam prints :D) and it is intellectually stimulating :D
I think Slumdog is a strategic mix of all selling points.
The core concepts of the movie are "rags to riches concept", "happy ending love concept and, "poverty,slums & child labor, winning the votes of human activists"
All of them individually have been USPs for various blockbuster movies. Danny Boyle has strategically fit them and scripted this successful movie which went on to be nominated for Oscars.