It's AA where Catchers prove they belong in the Majors or not. If he spends 1-1/2 to 2 years there to get his fundamentals down and refine all of his Catching Defensive skills, which is what he's supposed to be working on as a Catcher at that level, then the hitting will probably follow as he's showing he's able to get contact with the ball where he's been so far. OBP just hasn't been that important in his career up to now. It's the last thing the REDS care about with him. If he's OBP'ing in 2011 below .330, then I'd start to get concerned. But if he OBP's .310 again in 2010, it's nothing to be concerned about.
Just remember he's a Catcher. Catchers are brought through the system differently and through AA it's all about their Defense. Don't compare them to players from the other 8 positions. That's not how they're being developed.