James and Donna is in many ways one of the most amazing parts of Twin Peaks for me. They stick in my craw, and have done for well over a decade. I don't think the entire show, including this season, has the same impact without them.
I wanted to love Windom Earle. Ended up being a disaster, which Lynch did a fairly poor job of rescuing for the S02 finale in my book. Then the travesty that was Fire Walk With Me. Hated just about every second of it.
To me, S03 brings everything back a bit, and is the only way this kind of thing should ever have been done. The only reboot I've ever had much time for.