Jurrjens for example...that should be a memorable enough example for you. There have been other junkers that have had similar success since Jurrjens but NOBODY should be able to forget that one!
As for my views of Middlebrooks, I would not deny any hitter the opportunity to swing at pitches up and out over the plate. If you look at the hot zones for pull hitters, they are very often all three of the inside zones and (what a surprise) the up and away. That is exactly what I think WMB's hot zones will eventually look like and should look like. Up and on the outer third or out over the plate is a mile away from the pitches WMB struggles with and that I would like to see him decide to ignore. Even if he hits a strike low in the strike zone and on the outer third...where is that ball going? I would like to see him stay away from those with less than two strikes in hopes that he eventually coaxes the pitcher into a pitch anywhere on the inner third because those are pitches he crushes more and more as he develops as a hitter. Yes he came up as a hitter that seemed to be an equal opportunity hitter. However he was just a kid that did not know how to turn on the ball. Since learning how, more and more the preferred pitch for him is anywhere on the inner third. That in spite of the ball he hit in Minnesota that was up and out over he plate, headed for CF and wind blown to Right Center. When WMB hits them to LF, they don't a following wind...those cut right through the wind.