I'd probably feel a bit frustrated and not that happy with him. It happens to all guys on some occasion, so if they made up for it by ensuring I was well taken care of, that would be ok. If they didn't and sex just ended when they came, they'd never be having sex with me again.
I don't mind a man who apologises for it - I mind the ones who don't even acknowledge that it WAS to early and just ignore it and the fact they might have left you frustrated.
My current bf has some trouble with it happening too fast, he says it is because of how sexually into me he is. But my ex was just as much and he was normally able to control it. I don't mind if he makes sure I'm ok with it and asks what he can do to make up for it, but if you hug me and act like sex is then over that isn't ok and it doesn't make me feel hot or like he thinks I'm special or anything.