Adding to Madhu's response, the concise answer I have is - The whole is not necessarily the sum of the parts. Sometimes it's more and sometimes it's less. The rating of the film is not some sort of a weighted average of ratings of the parameters. It just talks about the film overall.
We could explore a little further though - usually, with all these parameters, the common linking factor is the very intangible effort called direction. You can have great work from the technicians, the writers, and the artists but it is the direction that finally makes the whole film. And it isn't an easy thing to rate direction. It's just too slippery an entity to discern adequately.
Jha is one of those directors whose craft doesn't even closely match his own estimate of it. Maybe that's what's showing up in the rating.
An idealistic young SP (Jha's preferred protagonist), Abha Mathur (Priyanka Chopra), is posted to Bankipur, located in the rural badlands (Jha's preferred milieu) of Madhya Pradesh where politicians, criminals and policemen (Jha's preferred villains) form an ugly ménage a trios, accessorized by lathis, guns and machetes (Jha's preferred props).
The local MP, Babloo Pandey (Manav Kaul), and his brother Dabloo Pandey (Ninad Kamath) terrorize the locals into mute submission, and are in the process of ruthless land-grabbing for the purpose of setting up a thermal power project. Th....