I did the Machete order before. The version where you go IV, V, II, III, VI. You leave out Episode I because it really doesn't add much to the overall story. And II and III are meant to have more of an impact right after the "I am your father" part in Episode V.

Anyway, watched it in that order and I actually had a good time. Keep in mind that I fully recognize the problems with the prequels, but I have always liked the world building of those movies. I also think the actors get s raw deal (as I stated earlier in this thread about Anakin) because Lucas is a bad director and writer when he has as much control as he did during the prequels.

As for throwing Rouge One in the mix? I'm not sure. While it DEEPLY connects to IV, I still view it as more of a side story. It's sort of like discovering extra cut scenes in a video game to flesh out the story. If you watch Rouge One followed by IV, that would work. But if you put Rouge One in the middle of watching the main episodes, that might be weird. I might try it anyway, though.