I loved Gyorg from MM, it's just a hardcore boss battle. The way it should be.
If Gyorg is the boss of the great bay temple then yes he is very tough.
One of my fave bosses is the boss of the temple of the gods.
But you do not actually kill him.
Its more of a test than an actual fight.
Another of my favourite bosses is the boss of the water temple in OoT.
He takes a while to kill and its so easy for him to grab you.
And he takes a lot of life off you once he catches you.
I also love Twinrova and how the sisters argue who is older.
Not a hard boss fight but one of the best looking boss fights.