Its just ego. It will always be that way with Macenroe. Commentary is a soap box for John.
My favorite commentator is Wilander. He the only one I have seen that goes deeper than shotmaking and percentage play. Wilander take it to a psycological level that other commentators ignore. A casual fan of the game would not understand most of the things he says.
I do have a fondness for Carillo. Her point of view on the progression of the game is genuine and she never seems to be pushing a product/player/image etc.
Also a mention to Vitas. He was a great commentator and probably my all time favorite. Interesting, analytical, no ego, and fun! He was the best. He really made you want to go out and play the game after watching.