Maybe it's just because I'm really, really used to it, but I find it somewhat disconcerting to have a content section without a left column navigation bar (like the messenger or the frontpage of the DLDB). I think it certain cases it would be really convenient to be able to always have a table of contents through which to navigate, but even more so the section just feels incomplete and bootstrapped without one.
so it can be beaten by a prepared pro, even in macro games, if only barely. the muta micro in particular seems really hard to handle for protoss ground though. In the open goons can't catch them, in the base they trip over buildings, it just instantly flies out of storms and they fly circles around archons. Mass cannons do work, but can't cover the whole map with it. Probably need mass corsair to counter and hope you can outmaneuver all the scourge.