I don't know if this is true but I saw on the Gamefaqs forums that seth's difficulty is broken when you install and download the update (at least on ps3) so if you played him on medium instead, he probably wont feel much different. Deleting your install and update data from the game data utility may help.
I've unlocked all the characters (including seth) and I did it without deleting my install or update. I think a simple jump kick followed by a sweep is the best method for seth
"Dr. Tenma, according to you, lives are equal. That's why I live today. But you must have realised it by now...the only thing people are equal in is death"---Johann Liebert (MONSTER)
"WAR is a racket. It always has been.
It is possibly the oldest, easily the most profitable, surely the most vicious. It is the only one international in scope. It is the only one in which the profits are reckoned in dollars and the losses in lives"---Maj. Gen. Smedley Butler
