What are you talking about? How is destroying all the reapers, controlling the reapers, and merging with the reapers "ONE" ending?
I think you need to go back and rewatch the endings. They are almost exactly the same, with very minor differences. The problem is that the endings don't show the long-term consequences of the choices you've made throughout the series. Like, what happened to the Krogan if you cured the genophage? Did they breed out of control and start another Krogan rebellion? What happened to the Rachni if you saved the Queen? Did they continue to work in peace with the other races or did they revert to their more violent ways? What happened to the Geth if you empowered them? Did they eventually become the new Reapers, as the Cital ghost kid suggested would inevitably happen to all synthetic life? The endings didn't really answer any of these questions, nor do they tell you about what happened to your teammates.