Shinobi fighters, such as Hayate, are usually very powerful, but they also tend to be very impractical in terms of input. However, veteran players looking for challenging mains will love Hayate for his obscure combos.
For example, his infamous Raijin move is so complex that many players just give up on it without even realizing the true power behind it. Some fighters are simply not meant to be played on your typical gamepad.
In any case, Hayate is a pro-level character that will surely prove his potential during the upcoming DoA world championship.