Hyderabad Blues was an experimental film that got lucky, Rockford was a pathetic filmmaking exercise and Bollywood Calling is finally a bonafide movie.
It has maturity, good plot lines, well-developed characters, humor and realism (though a little exaggerated at times). Even though it seems like a movie for a niche audience (people who are interested in the filmmaking aspect of movies), it's not just about that - it's a regular movie for regular audience.
It's a better-made movies than most of the junk we see lately. Watch it - it's fun! BTW, Om Puri is extremely funny. I've always seen him poor and dying but this role is particularly refreshing!