Hayabusa's an awkward opponent to fight if you're unfamiliar with his limitations and the like. He's not really fought like other characters are, but once you figure him out, he's usually not that scary outside of certain environment conditions and hiC Izuna holds.
The only real thing that's annoying to me is all of his gaurd breaks.. and trying to figure out what they'll do after them. he also has so many good options on doing things while you do a wake-up kick so I generally never even try it