Well, I never said anything about business "skill". However, it's hard to ignore the reality that, relative to his own ambitions, he has had a spectacularly successful career. He's made a lot of money (exactly how much we don't know), he's famous, he's ****ed a lot of good-looking women, & now he's President of the United States. The process by which he has arrived at this is rather besides the point.
I don't really buy the idea that all that has to do with his dad being "a very successful business man". He was certainly the recipient of "affirmative action" due to his relatively privileged upbringing, but the whole Trump brand has really been his own creation. This is part of the problem: in spite of being an asshole, messing things up several times in his career & screwing over many people in the process, he's always managed to come out on top. He sees that as proof of his brilliance.