No he wasn't... Starkiller was fried by Sidious's Lightning in the Novel, he just had as much resistance as possible to grab Sidious so the lightning would be attacking both of them.
@Wolfninjajedi, I neevr said anything about Sidious. Even though barely, he still beat him in the second Novel. Not many could do that.
Ya but in the 2nd novel, Vader fought him "disinterested" which means he probably wasn't going all out at all seeing as he was also trying to turn him while fighting.