I agree Gizo. Good analysis. All the "greatest players ever" have big time pluses and also some minuses and you've discussed the McEnroe rivalry well. They played 14 times and ended up 7-7 having played each other only on carpet, hard courts, and grass at Wimbledon. This was when the surfaces were faster indoors, at Wimbledon and at the US Open too. Plus, with McEnroe and the old technology, the dynamics favored a reall great net rusher more than it does today. Borg won two big matches at Madison Square Garden versus McEnroe both in January 1980 & January 1981, while losing once at Wimbledon and winning once at Wimbledon. He lost both US Open finals, while winning the FO twice in both 1980 and 1981. So from January 1980 until the the end of 1981, he won two YEC, one Wimbledon, two French Opens, and lost two US Open finals. That's a stellar record by any account at the four biggest tourneys during those years. Of course, you didn't have a slow hard court major to compete at either.
No one could manufacture a man that won 6 French Opens and 5 Wimbledon titles in a row. - Andrew Longmore