Looking at the last couple of series, I am coming to the conclusion that Gibbons is managing scared. In past seasons, if he messes up, there was always some holes in the team (e.g. bullpen last year) that he could always hide behind. This year, there are basically no excuses and it's like "just don't screw it up". His quick hook, IMO, worked well in the Yankees series, especially the 2nd game on Sat. I have to admit that he piecemealed that quite nicely given the options (or lack thereof) that he had. His quick hook on Buehrle, playing Zeke instead of Pompey, etc - I chalk it up to managing scared. You couple this with him being old-school (ignoring data like splits last night, under and over managing in close games) and this is what you get.
I agree with the posts before - If I have to put up with Gibbons in order for me to keep AA, I'll take it - assuming he can restock the farm system and "fix" the starting rotation one way or another next year.