I remember when I played MM1 on my NES. It's great to have for the collection, but yeah after the polish of later titles, the roughness really stands out.
I'm mostly looking forward to revisiting MM4 to 6. MM5 is actually the very first game I ever owned, and thus probably my favorite of the NES titles.
If I was to choose how I play MM1, it would be the Powered Up version. The controls are better, and the addition of the Robot Masters to make the standard 8 is a nice addition. (Though I still kinda wish we got Bond Man)
I still haven't gone through Wily Wars. I really need too, but again MM1 is not a game I enjoy revisiting that much. Even when it's like that. So I haven't gotten around to it.
Maybe I will eventually for Friday streams. I do have a physical copy for my Genesis thanks to Limited Run.
One last thing. I'm a bit disappointed that many of the trophies for the MegaMan collection are those challenges. Seems to get all the trophies, I'd need to get a gold on each stage, and honestly that just sounds like a pain in the butt and not worth it.
(Edit: This is just my brain over thinking things, but to clarify, by a legit run, I don't just mean not using the rewind or save state functions of the collection, but no pause trick either, as I absolutely used that trick back on my NES copy.)