I see most people complain about the editing of Audio but from what I've seen and used it for it is far more than adequate.
This is something that's puzzled me for a while, because I do all my audio editing in Reaper's main project window and never really have a problem with it. Not sure what it is people are wanting it to do that it can't. I'm sure someone can fill me in, though...
Mixing Secrets for the Small Studio
A complete mixing method based around the techniques of the world's most famous producers.