Excellent post, and I agree with everything you said. The W.C.O. has to have the right personnel all around in order to be effective against a decent team. You need smart receivers who can run very tight and precise routes, and a smart QB who has complete trust in those receivers and can do a quick drop and scan the field and make the right decision very quickly.
As you said, the Redskins just don't have those guys who are well-suited to do that. Really, not many teams do.
A couple of other items, you need good weather or a dome, and you need to be able to write off the season if your QB goes down. The WC O is more like a basketball team than a football team.