Could have been better if the original facts weren't diluted by debutant Meghna Gulzar. Nevertheless, it's a must watch. You are bound to like this movie if you crave fir artistic Bollywood cinema.
Lastly, I would like you to watch Rahasya which stars Kay Kay Menon and is based on the same story as Talvar. The major difference is that Rahasya is a RAW film but Talvar is diluted as the original family themselves gave the story rights to the makers of Talvar.