Just wanna add my opinion if you don't mind.
Johnny was stupid broken in GGX, from what I remember.
http://www.youtube.com/watch?v=VWrl7CboQZw lol mist lol.
In AC, his mist got destroyed by the nerf bat. Jackhound still has a use, but at a higher cost. Good news is that 3HS came back. I also prefer the old DB, compared to the knockdown DB. Then again we have KJ, which can kinda do the same thing.
Also
ALSO
I think Blade has a valid point, sort of. If a person can play #R online, learn the mechanics of GG, then move on to AC and learn the Forcebreaks/Slashback it's all good. However, telling someone to actually play Isuka is just wrong. Terrible game is terrible.