Finally someone who sees eye-to-eye with me on All Star B&R!
I felt the exact same way about it. I didn't think it was the greatest Batman story of all time either, but I definitely thought it was a good, fun read and it was just Miller taking things to their total extremes.
In that Miller/Eisner book I read a few months back, Miller talks about how people feel that Batman is so sacred and if you change one tiny thing about him, people go nuts, and Miller was intentionally was stepping outside the box with him. Just saying this to back up the thought that Miller really isn't losing it, he just made a conscious decision to take Batman to the total extremities (and probably beyond) of his character and personality.
But yeah, thanks for making me feel less crazy by acknowledging that you're enjoying it too.