I never died once on any of the bosses except for Argarok. He knocked me off the columns at least twice. Blizzeta nearly killed me but was unsuccessful. Ganondorf on horseback and Zant just simply took a while to beat.
Btw, none of the bosses with the "eye" weakness have any votes (Diababa, Morpheel, Armagohma.) You know why? Every Legend of Zelda game has at least three eye weakness bosses and anyone who has even heard of Legend of Zelda knows how to beat them. Nintendo needs to come up with better weaknesses. And also, Fyrus and Ganon's weaknesses are based of of the eye weakness too.