Shoot Ogawa brought this down to its bare bones when I saw him lecture in South Shields. Essentially, he said that if people don't like you, they won 't like your magic - regardless of how creative or technically brilliant you are.
And he's right.
As an example, I have immense respect for Marc Oberon as a magician and inventor. I think the man's a genius, and he has the kind of technical talent that I can only dream about. And he's a really nice guy to boot. But on stage, he comes across to me as a smug git. I like the guy, I love his magic, and I really want to like his performance, but there's just something about his stage persona that's profoundly punchable.
In the work I've done, I measure my success not on how many sleights I did faultlessly or how many people I 'fried'. Within the first 15 minutes, I want people to make eye contact with me and smile when I walk around. I want people to feel that they can chat with me as if I was one of the guests at the function where I'm working. If people are relaxed with me, then I'm doing a good job.
If I was to condense any of my limited experience into bullet points, I would say:
Be approachable
Be genuine
Be friendly
Take time to chat to spectators - make the performance about them
Smile
Ultimately, be a nice guy, and people will like you. If they like you, they're more likely to like your magic. Especially it's obvious that you're having fun with it too.
Pete