I have a similar opinion except Cannith manufactory. Won't give credits to the design there.
Kings Forest, on the other hand, was also done with a similar moodscape plan. It seems warm and inviting – maybe like the Orchard once was before the Abbot appeared. Yet once you get to the Drow area you begin to see the blight.
Honestly – and I don’t give the people who made DDO a lot of credit – but places like Cannith Manufactury, Kings Forest, the Underdark, 3BC, High Road, and even the Cerulean hills are brilliant in how they were designed, and implemented. All of these are created to invoke a specific atmosphere, have very environment-centric explorers (the letters in Cannith I thought were really well done and are among the few that I actually listened to when I was exploring), even though I wasn’t a fan of the way the explorers were done in Kings forest. I did really like how they did the rares, however. You could run that area for hours just for the rares.
But the theme is that they are all unique, they all play off a specific mood or atmosphere, and do so rather well. You may not like the fact that Cannith is cold and uninviting, but that’s how the area is SUPPOSED to be. And that is exactly what they were going for.