It's not harder to win at all, it's just they Hi-Counter Hold EVERYTHING on PS3. You literally cannot finish any string against them. I also liked to play arcade, versus and time attack on Legend, but now it's shit. Because all I have to do is Jab and 66T.
This could be a problem effectively. I still need to play Arcade and time attack on Last Round, but to be fair in versus it's never seemed me that this happened. Later I will test it (I have an X360) and I will say you if this is something that happens only on PS3 or not.
I have appeared to have fixed the "problem". What I did was, I put it on difficulty 7, beat it, then put it back to 8, and it is so much more fun to play. They are all back to normal now.
It may have been a case of me constantly having the difficulty on 8 from December 2012 till now. I still advise to test it Kronin, because I'm not sure if it was just a thing for me.