The F4U Corsair was another amazing aircraft. The Japanese were terrified of it. The A10 is straight up badass. I don't think ugly is the right description either, I think what people are getting at is "mean". It looks mean as hell.
And its looks are deceiving when it comes to aerobatics. Those big straight wings give it exceptional lift and low speed turning, good loiter time too. It has a rugged, low tech appeal.
From the link at the top, the 30mm round it fires weigh 6,560 grains. For perspective, a pound is 7,000 grains. Each one of those rounds is nearly a pound!