A large number of his GBs are disadvantage and majority of the moves he throws out are quite slow. He's likely a character where you have to be sure you understand the character your opponent is using and how to punish back with Raidou. Speed is generally not in your favor.
For starters, Raidou is a character that requires an understanding to the game from the player's part. Raidou has obvious flaws that can potentially put the player at risk 50% or more majority of the time.