It is rated a six because it is watchable. Because you aren't likely to get up in between and leave the hall. And because Akshay Kumar can be both adorable and competent enough to carry a film on his broad shoulders with a goofy grin. And because P C Sreeram can make the world look beautiful no matter what populates that world.
But the six has little to do with Arunachalam Muruganantham, the man whose mad, mad story Padman tries to tell. That story could easily have been an eight. And in the right hands with the right inspiration it could have been a nine or even a nine and a ha....