Sif3r wrote...
I think a lot of the dislike over the endings is down to the fact that people are just selfish when it comes down to the decision that matters. Save myself? Or sacrifice myself so that everyone, everywhere will live in peace? It's why people didn't like the Matrix ending, because they can't fathom why someone would sacrifice them self, because in the end, they wouldn't do it...
But, everyone is free to their own opinion and if you dislike the ending, fine...your choice 
Not really sacrificing yourself per se, well not in the control ending.
You control reapers, they can do whatever the hell they want. You can talk through the reapers just like Harbringer did. You lose everyone that you know and everything you were, but in turn you become immortal through the reapers themselves.
Any threats to the galaxy, you can prevent with the reapers, any wars can be stopped by using the power of the reapers, and you can help rebuild everything using the reapers Tech that you saved by not destroying them.