Finished the last of the Ender “quartet” a couple of weeks ago.
The guy can definitely write!
I have another of his works in my “to do” pile.
I loved “Treason” - get a recent edition, some changes are there, “Wyrms”, “Worthington Saga”. I read, but was cols with Earthfall quintet.
In Ender’s series, I like but see different strength in the “vertical” and “horizontal” parts: The vertical is going deep into the future and is more hard core scifi - contact with ET, development of human societies on different planets. The horizontal series follow the Ender’s game (”shadows” titles) in the Earth real time and are more political scifi - what might happen in a near future. IMHO, the second is weaker as literature, but fascinating as a political exercise.