Yes. And this very mixture of the worst of both worlds is the problem. Do a decent Khan copy (like, guessing that the next villain is Khan and a fairly good one, in the upcoming movie) or do a decent mystic character.
But as you pointed out the focus of the movie is thankfully not on this abysmal villain so it is just a minor issue. Nero aka Khan 3.0 aka Shinzon 2.0 is as horrible as Shinzon aka Khan 2.0 but does less damage to the movie as his role is smaller.