I think you just summed up my feelings about Max very nicely. I'm really disappointed in his performances - he came into F1 and I was really impressed, I accepted the silly mistakes that he made at the time, his lack of patience, the poor race craft, but admired his underlying speed.Verstappen just screwed up is own race and only he is to blame for it. How partisan as I am... For me he showed why he could screw up WDC chances in the future. He's a hot head without patience no matter how brilliant of a driver he is.
Unfortunately, as the years have gone by, it seems to me that his shortcomings have remained - the rookie mistakes, the anger he seems to be controlled by, his inability to see the big picture, and I honestly think that he has convinced himself that he is better than he actually is (or the people around him have convinced him of that). That's why he seems to get so angry, because the reality of his driving does not match up to the myth.
He is good, yes, but I would not be surprised if someone told me that he will never be WDC. I'm not saying that will happen, but he so often becomes a victim of himself - not of bad luck, or inferior equipment, but I think he just defeats himself.
May I be proven wrong