Ehhhh, I've never been a fan. Just in DW and Iron Fist, he's always come across as overly dramatic, scenery-chewing for the sake of it.
Could I do what he does? Nope, so props to him but I'm just not a fan.
Personally, I had thought a cool conceit would be that the Master somehow becomes a voice inside The Doctor's head for a couple of episodes/season. Similar to how the Joker was in Batman's during the Arkham games.