Imagine a sales person approaches you to buy some product or service. He promises lots of benefits/savings and tries to hide negative points. You seem to think that it is a win-win situation for you. But then hidden negative points get exposed, may be after you are already bound by an agreement.
It is duty of PM to take a decision considering national interests (may be in favor of N-Deal). However, MMS seems to be more interested in his own interests and misleading the nation.