It was a cool idea and Siddig did an excellent job with the episode, but I can definitely understand his frustration. It pretty much reveals that Bashir was putting on an "act" for the first half of the series, and pretending to be someone he wasn't in front of his own friends.
I mean, are we seriously supposed to believe he never once confided in O'Brien about this family secret? Or Dax, who he liked and confided in about all kinds of other
things? Especially for something that didn't seem all that
Although still, in terms of false story notes, I don't think this comes close to the Odo/Kira romance. That is one I just didn't buy for a second.