Harry Potter is is very good Quidditch player in my opinion because he has never lost a game to Gryffindor House and even won them the Quidditch Cup! He always knows when to snatch the Snitch and is a speedy flyer with good grip. He is always prepared to go out there and do his best.
But, he doesn't always keep his eyes on the field and got himself banned from Quidditch.
Harry Potter is a very good friend to Ron and Hermione. He never judges them or reveals embarrassing secrets about them. Nevertheless, his loyalty to his friends is unquavering.