Curious, is there any video of expert D&D players playing? I used to be a big DM in my area back in the day (probably around 1981/82), but since the internet wasn't as prevelant there was a lot less communication about how the game was supposed to be played (and I wasn't in a large metro area -- so I pretty much set the rules for the town). To this day, I'm curious as to how the game should actually be played.
For what it's worth, RPGs are a rather specific thing, since they can only work if the given group works as a group. This form of gaming is a communal effort, a DM who doesn't adjust to what his players wish for will soon be without a group. Both the DM and the players are supposed to have fun. They might need some nudging here or there, but overall, they are just as much part of the process.
Most questions in any RPG forum I've ever seen center either around meta-gaming questions (rules and how to enforce/circumvent them) or about how to deal with situations that arise from a specific group constellation. If you have a group that likes the fighting but dislikes riddles, a DM avoiding juicy fights and drowning them in riddles does them a disservice. Most problems however arise from less homogenous groups, where some people fancy one thing while others would like to focus on others.
Ultimately, every group has to find out for itself what does work and does not work. Other people can give you hints, propose changes, improvements or overall just tell you about their experiences and how they deal with problems, in order for you to be able to compare their problems and solutions to your own.
[edit] Something like stackoverflow works in much the same way. The community can propose solutions to a specific question you put forward, based on their own experience and ideas, however, you will ultimately be responsible to figure out whether the proposed answers are right for you and your specific contexts and experiences.