Not to get totally off topic, but I hate when people presume everyone hated the Mass Effect 3 ending. I loved it.
Though I agree that it's stupid they're releasing DLC to change the ending, but for completely different reasons than you do, I bet. From mine, it's hard to respect a company without the artistic integrity to stand by the story they envisioned, and this among a million other things over the last few years have slowly eroded my once rock-solid faith in Bioware.