Bore! Nothing even close to 'Oh my God'.
Some parts are infact an insult to Amman and Hinduism. eg. when she is shown as getting angry when Urvashi's character worships Lord Balaji. Scenes like that make Nayanthara's character sound puny instead of powerful. Also, that's against the very ideology of Sanatana Dharma.
Nevertheless, Nayanthara and Urvashi maam are stellar actors. The only saving grace of the movie is the powerful performances by these two actresses.