Good luck to Brum with Delhi and all that but as someone who travels to India 4/5 times a year, I will continue to use Emirates or Etihad, mainly because I go to places in India that aren't Delhi (mainly Bangalore but Chennai too).
In my opinion MAN to India is better served than BHX to India because of the seemingly endless connections to this huge country through multiple daily flights.
I visit Dhaka occasionally too but even when they offered flights from MAN there is no way I would have used them - it never even entered my mind - again EK,QR etc