Actually we are closer to the 1/3rd mark than we are to the 1/4th mark and I believe the numbers for McCutcheon against RHP over the last few years has been well documented. I think the irritation that McCutcheon was getting so many starts against RHP, when it is clear his days of owning or even renting them is over, morphed into a general irritation with McCutcheon. It really isn't his fault that he's consistently been put in a position to fail, it's the manager's. And if they made a deal to play him 90% of the time he's available when they signed him then that's on management up and down.
The most positive projection systems now have him at about 0.6 WAR for the season as he's at -0.6 NOW. I don't think the Brewers ever wanted to spend $8.5M for 0.6 WAR. That's just foolish for a small market team and not what they expected. He could make it to 1 WAR, but they need to stop rolling up the negative WAR by slotting him in against almost every frickin' RHP. And as I said above, CC hasn't played matchup with McCutchen (or Hiura or Taylor or Cain or Renfroe) yet, so why do you expect him to change?