Today None of the Above (NOTA) gives you the right to reject all candidates if you think they are not deserving. But even if NOTA secures the highest votes, the candidate getting the remaining votes will won. It will be beneficial when the Election Commission conducts re-election in a constituency where NOTA gets a certain share of votes. Today election is taken very seriously in India and people want to give vote to right candidate which they want to win.
Actually in election all candidates want to win and for this reason there is huge competition between them. During election different candidate give different types of promises to people but actually the reality can be very different and due to this people actually think something different like giving vote to NOTA. In reality it is very difficult to understand how much useful is NOTA as it affect the election minimum but still it is up to you to what you think about NOTA.