0.
Am I dead?
The Catalyst had fired. The Reapers had been destroyed, all synthetic life taken along with it.
Am I alive?
The galactic community celebrated endlessly as the great extinction had been prevented.
Was I successful?
Commander Shepard was the greatest hero of all time, uniting the galaxy and making the greatest sacrifice to save everyone aboard the Citadel.
Was it worth it?
A body lay in a concrete ruble on the dark and gloomy street. An explosion occurred during the firing of the catalyst. Countless fragments of the Citadel flew down into the atmosphere. A body, protected in sheets of metal, flew down with them.
Did I save them?
That body belonged to Commander Shepard.