I don’t think Kyrgio’s career has been a disappointment either. Nevertheless, he has never fulfilled the expectations people had of him. He never became a TOP10 player, never won a 1000 tournament and - apart from Wimbledon - never reached a semi-final at a Grand Slam. His doubles victory at the AO was a nice highlight, but his career as a whole will hardly be measured by that. So for me it stays the same: Kyrgios remains in the “what if” category and, in my opinion, could have made much more of his potential.
I don’t think Kyrgio’s career has been a disappointment either. Nevertheless, he has never fulfilled the expectations people had of him. He never became a TOP10 player, never won a 1000 tournament and - apart from Wimbledon - never reached a semi-final at a Grand Slam. His doubles victory at the AO was a nice highlight, but his career as a whole will hardly be measured by that. So for me it stays the same: Kyrgios remains in the “what if” category and, in my opinion, could have made much more of his potential.