Seems to me it's actually the opposite. It's anathema to say anything bad about Billy Beane, not just on this site, but on any site with a saber slant. It's like going after saber baby Jesus or something, so swift and brutal is the reaction. I find Beane to be overrated, always well protected by the curse (blessing, in this case) of low expectations. When his teams are terrible (which happens frequently), it's "well, look at their payroll"; when they do well, it's "that Billy, he's such a genius, doing it with a low payroll".
I thought the Donaldson trade was terrible, and not because the Sox weren't able to bid, though I'd admit to be annoyed at that. He's made other terrible deals, as have most GMs. In that one though, it was the sheer arrogance of the process that was apparently followed, the tunnel vision in trading that kind of player. There's just an underlying arrogance there by BB that in my mind at least, is certainly not justified by recent performance. So yeah, I'll dare a dissent on how great a GM Billy Beane is.