Ok, please correct me if I'm wrong:
Our hero makes all the effort to get that Holocron, and then Vitiate father comes out, and obviously he would be no match for him, cause you know, he killed him when he was 10, so yeah, pointless effort, but sure at least he tried something. Now Valkorion is inside our mind, we have to fight Arcann and Vaylin again, only for them to be brought back again, and then turned against Valkorion, then we ally and fight him, only to prove that he is to powerful, and then suddenly our hero realizes " My mind, my rules"? Seriously, soooo, Tenebrae, Vitiate, Valkorion, what ever, is more then 1000 years old , is studied and mastered the dark side more then everyone else, can bend your will, he could transfer his consciousness and power from people to people at his will, he consumed two planets, as far as I know, and yeah I know is not dead dead, but technically lost his powers and is out with the mere sentence "My mind my rules"? After all his legacy, he gets inside a mind, that I belive he did many many times, and is overruled like that? Did BioWare and Electronic Arts let J.J Abrams write the end of this? I would expect we would have to learn some sort of Dark Ritual or something like taht to bring him down, I mean, after he lived so long and learn so much and gain so much power I would assume right? I might be missing some detail to this please let me know!
But just really disappointed!