How is that not fair? Those are the three names he's competing with. He wants to become #2, maybe even #1 (although right now that is a distant reality). Those players never fall apart - why is Andy so prone to doing so? How can he hope to compete with them when he's getting torn apart by the likes of Del Potro?
I hope this is just a one-off, but that was a really worrying collapse after a good first set. Mentally seemed to be all over the place, which is not what we've come to expect in the last 10 months.
It's not fair, because you are not comparing like with like. Mr M is not the other three, and never will be. He is who he is. He may ever be as good as Federer, Nadal or Djokovic, but he beat Djokovic and Federer for the Olympic Gold, Djokovic for the US Open Title, and bageled Nadal, which is more than any other player. If being behind those three is as far as he can get, fine. That's him.
No body forces anybody to support Murray. I am sure that there is space for additional supporters of the other players. If you support Murray then this is who and what he is. Why do folks constantly demand more of him. I genuinely don't understand it.