That's pretty much what I did. I went from 0 DLCs to all but Omega when I got Citadel. I now end all of my Sheps with Citadel, because the game start going downhill post-Horizon. Still not going to pre-order anything from them, but Citadel gave me hope that they still have the opportunity to save themselves.
Here's hoping the next ME game (If they do make one) will improve on the mistakes of this trilogy. But despite the terrible endings... we've had a good run haven't we?
Well the endings vary but it ends with Shepard saying "The best." which is basically calling a close to the trilogy. I am sad to see it end but here's hoping there are new ME games to bring us back.