I disagree,
Raider is definitely not OP. All his attacks are easily parried, dodged and are fairly long. He also has no hyper armor or descent opener and mind games are needed to win with him.
On the other hand, I would say that Shaman, gladiator and PK (on console, never played on PC) seem to be a bit over the top.
Especially when it comes to how far they can dodge and their recovery time after every move. Light spam is also annoyingly hard to react to consistently, due to the lower frame rate.
Most of the characters in this game doesn’t have openers and you need to feint a lot. He has unblockable attack which most characters don’t and many options from there. But it doesn’t make him OP of course.
IMO it’s stupid how grab and run thing takes stamina. Same with stun attack taking stamina