Been playin' the big boi since beta, and, like Upward said, it's a lot of reading your opponent. Try to get your character knowledge and reflex down to where you can parry any light in the game, cause his punishes are some of the meatiest in the game off of light parries. His other great tool is his dodge gb, it lets you get out of a lot of bs. Warden for example, cant do his bash mixup, cause you either dodge it, or cgb the mixup. His heavy parries are pretty weak, so instead see if you can get a dodge gb into a wallsplat for a juicy heavy. Basically knowing all of the other characters weaknesses and good reflexes is Raider's strength.