I consider myself to be a pretty good Raiden and Jin can give me a lot of trouble. I can have a real hard time getting in without meter and Jin's combos can dish out good damage that I end up using my meter to break leaving me with very little to get the damage I need in combos. I've noticed Jin players usually follow a pattern so if I'm playing a set I can usually handle once I spot my opponents habits.I haven't played any good raidens, but how does he hold up against strong pressure Jin?
Aside from Jin, the other characters that give me trouble are Kano, Jax, Goro and good Scorpions. I'm unsure about Liu Kang and Kung Lao, haven't really run into any really good ones yet but I can see how they might be tough to deal with.
Ultimately I think it's still too early to tell. I'm not familiar enough with the matchups yet so it's hard to tell if it's the player or the character that's really giving me a hard time.