Hayabusa is top tier arguably. Easy to use? Well, maybe in the sense that anyone can spam teleports in 1-bar lol. But competently? Doesn't get much tougher than Busa.
Wow, that person is wrong on so many levels. Top tier? Hell no. Easy to use? Well, certainly feels easier than in previous DOA games(at least for me), but when it comes to the ninjas, he's one of the harder ones to use and master(Ayane being the other one).
Hayabusa is a top tier character because he has many tools, in juggling, throws, holds, and zoning. Is he easy to use? I'd give him a medium difficultly. I always found him really fun to use because of his offensive/juggle heavy playstyle. Pressuring your opponent into the defensive and using the first part of the izuna throw into juggles will leave a lot of your opponent's rage quitting like no tomorrow.
Hayabusa is nowhere top tier in DOA5. In general, Hayabusa is difficult to use but when I use him in online, it was pretty bad for me because some of his important moves such as 33P, WR4K, and Ongyion teleport attacks will come out as P, 4K, and 88 instead. And of course, the Shoho-Izuna timing. Ironically, he is my main but yet in online I can't even use him at my best.