No he is not.
He cares not one iota about tradition, dishonors (and breaks) the Jedi Code AND the Sith Code, brings about the downfall of the Republic AND the Empire, betrays both masters (Obi Wan AND Palpatine), betrays and tries to kill both apprentices (Starkiller AND Ashoka) chokes his wife to death, cuts off his sons hand then tries to kill him, and tortures his daughter.
He never keeps his word, happily betraying Leia to blow up Alderran, lying to Lando (I'm altering the deal, pray I dont alter it any further), lives and operates outside the law, is unpredictable (an audience with him is just as likely to see you getting choked to death as anything else) and literally acts how his rage and hatred dictate.
He is unconventional, unpredictable and literally fueled by hatred and rage.
He follows the Emperor out of fear, constantly trying to betray him (first to Padme, then to Starkiller, then to Luke, then again to Luke, before finally pegging him down a shaft).
As a Sith he is no less unconventional and a wild card that he was as a CG Jedi; it's just he has lost all sense of morality (becoming Evil) and now works as an agent for a LE Regime.