Also, whereas the combat encounter section is excellent from a mechanical point of view, and - contrary to widespread opinion - I think the skill challenge section is not bad, the section on adventure design is awful.
In the combat encounter section there is no discussion of theme or story from the metagame perspective. All that is found in the W&M prequel. The only bit of the DMG that really compares to this in tone is the section on languages. I think a lot of that W&M stuff could have been dropped into the DMG whole-cloth and made it quite a bit better.
Agree 100% - it's insane that W&M has so much vital thematic stuff that got cut from the 4e DMG. I remember comparing the Planes section from the DMG to the same in W&M and going WTF?!?! - W&M had far more & better info!!