Op OC's can be found cool, just like Minus_Official said, but really sometimes you really can get a bit irritated at em for making it seem like the character is invincible or too powerful like Rey in Sequals.
Op oc's can be cool but annoying. Like in Rp's where you have to fight them then their just annoying because there's no chance of them losing the fight so it makes fight rp's kinda bad