Talking about WED like totaly useles tool is something that I can not except.
I learned WED within few weeks and now I have problems only with my creativity, not with something that I can not make in WED. You have BSP boundaries but there will be alvays workarounds. After I learned few realy good advices from Dan's 3AM I became good level maker and I can create almost anything. I can not say nothing about Quark or other tool for level design, but I can tell you that I am sutisfied with WED. And if we get mirroring tool, or arrays it will be great tool.
I am using MED only to bring and to prewiev models before I bring them in wed. It is obviusly that you can not get max for that money.