He comes off as unpolished and in over his head, compared to others on the national stage at his level.
The impression he always gave me was that he was the kind of guy who rose in rank in the military because he kept quiet and knew the right people. When he got to a certain level, he didn't need to keep quiet anymore. That's when his problems became most apparent (his 'starting WW3 moment,' and most of his presidential campaign are good examples of this).
It's the difference between a man with balls and a man who acts like he has balls. He is in the 'acting' category, in my book, based on his behavior as I have seen it on the national stage.
'Not ready for prime time.' A classic case of a guy who started believing his own publicity - no restraint, poor judgment, and questionable wisdom.
A Perfumed Prince is the term I believe the military uses.