Thinky Master thoughts: The Essay

So on Sunday after watching Reign of Terror myself and M., after reading and discussing another article, came across titled 10 Reasons We Want The Master To Return and... strangely enough, ended up disagreeing with the author on all points. Which, as you know, nothing is better for inspiring discussion.

Disclaimer: 1) I haven't seen nearly all episodes of Doctor Who, not even the ones with the Master. So be gentle if I say something totally dumb, but also feel free to let me know how you see it. 2) ... I ship the Master and the Doctor and that will probably come up. JSYK. 3) Lots of things are subject to interpretation and/or taste, and that's cool. For example, I don't like Moffat's writing but a lot of people seem to. And moving on.

( So, just WHAT is special about the Master as a villain? )