There is not much NOT to like about the guy if we are all deeply honest.
The guy is whip smart, extremely articulate (not in a jokingingly using that word way) and just flat out one of the best communicators and public speakers I've ever heard in politics though I haven't been around that long.
He has rational positions which he defends with equal persuasiveness and sound logic and he lets those factual basis and positions speak for themselves. He's not too extreme one way or another and doesn't play identity politics.
He has military experience. He has governing experience, as small as it may be via South Bend, IN, and he has strong business experience and acumen.
The problem isn't that he's gay. The problem is he is a young, white, affluent male with obvious brains and ambition, thus he was born 25 years too late because the Dems, via the progressives and far left of the big tent, will never embrace him fully.