I still feel that a better canon reason for the Master to be the way he is would be if he were more like Xanatos from Gargoyles. He is genius, a little less so than the Doctor, but still quite capable.
Doctor Who is known to take aspects from stories around them such as The Space Pirates pacing itself after A Space Odyssey, and John Simm is strongly influenced by the then recently released Batman The Dark Knight movie. The scene where he killed the politicians for electing him almost seems like a scene out of Burton's Batman (Not the one with the Penguin).
The Old Master, Ainley and Delgado, they were always suave and in control and tended to side with the Doctor when things got out of control. The portrayal of the husked out one during the TB years, all 3 of them, were interesting, but only for a short span of time. The movie one seemed to loose too much of the essence of the original Masters that if he wasn't called the Master I would never have realized that was who he was trying to be. I can't fraud him on bad acting, but he isn't the Master. He doesn't display mastery. XD
John Simm, however, was down right insane, going even to cannibalism and wife beating. Rather than being the Doctor's rival/arch-nemesis, they tried to rewrite his character entirely. The drum beat really came out of nowhere and if he reappeared, it would be gone because it was simply a plot device to 'bring back' the Timelords. Putting him next to Delgado, they seem like complete opposites with almost nothing in common except the name. Again, I'll say his acting was not bad, but he was not the Master at all.
Si-Fy and Fantasy, that is where my heart lies. To Doctor Who and its 18 years of brilliance, still waiting on the 50 yr anniversary!