what I have seen is that if you want careful analysis of a movie or scene in Bollywood you won't find a place for that. the fans of Bollywood are typically more interested in what their favourite actor is doing, not the movie itself.
I have gone to several Hollywood websites where there are tons of people discussing the meaning of a particular scene or the way it is shot for hours, but I have not seen that for Bollywood. maybe that exists somewhere, but I haven't found it, and neither do I understand filmmaking that much that I would indulge in that type of discussion.
as far as discussion is concerned, some healthy discussion does happen, but not always, because eventually you are repeating yourself.
like even if we have a healthy discussion about why SRK is behind the other 2 Khans, eventually the point you'll be making is the same no matter how many times it's discussed. and that is one thing I have seen in Hollywood sites as well. for example, in some Marvel posts, Age of Ultron comes up. some say it sucks, some like it, but eventually the arguments being made are the same, and those comment threads have been happening for 3 years now.