From my limited research and tinkering I've found the 1010 fell into two classes when it was manufactured; "Good Tractor" or "You Can't Fix It." The 1010 is a hodge-podge of old and new. Old from the 400 series and new technology of the New Generation. It also seems a few "innovations" were tried, like the one-piece sleeve deck (shared with the 2010). I don't know if it is necessarily good or bad until you have to work on it. You have to replace it as one piece instead of being able to only replace/repair one cylinder.
I would imagine that today most running 1010s, 40 years later, are probably "Good Tractors" as far as old tractors go. I don't think I'd buy a 1010 out of the weeds and hope to bring it up to speed. I just don't think it is worth taking that chance when there are other "proven" green tractors out there.