Some people are coming across as having an axe to grind for whatever reason. They seem far too eager to tell Varis he screwed up or did it wrong. It's HIS game, HIS players and if he was so horrid I believe they would have bailed long before now. As for the people who like to pick apart each instance out of context for his explanations of what and why he did something I have one question are you that perfect? If so, that must be nice. Or a question to the people that seem to want to blame him no matter what he explains, did you have a DM that screwed you over
consistently due to lack of info or only giving useless info? If that's the case maybe you should keep that between you and that person.
I DM/ref and also play and I would be psyched to have a DM from my perception of his thought and caliber in my group. If you game with the same people long enough only putting items out there that only further the main plot gets boring but hey that's my POV. I think he did an excellent job of handling the situation he was given, trying to accomodate both groups of players and what was THEIR desired course of action. Remember seeing a problem with 20/20 hindsight is a wonderful thing but trying to handle a group of people and accomodate them while keeping things challenging is no simple task, expect mistakes to happen and not everything ever comes out "perfect".
Btw for the record I don't know Varis from a hole in the wall. As for the thread title, pulling the rules together and thinking how to handle the mechanics I would see as skill, keeping your players enganged and have the plot flowing is an art, but that's my POV.