Sorry for my English. (GOOGLE TRANSLATION). Nobody has complained about before paying. We complain to pay for anything.
So if I get you right, you complain because you paid for a the broken DLC, right?
But be honest for a moment, you paid the DLC with microsoft points, didn't you? So before the DLC was out, you couldn't do anything with them (because you spared them for the Dawnguard DLC) and now you can't do anything with them either because you already purchased the DLC and need to wait for the fix, so actually...nothing changed at all. The only bad thing is that we have to wait even longer (which is indeed anoying but not THAT bad. ) Its a bit like preordering, you don't have the money anymore but the product will be there in a few (days weeks whatever) .
And sorry for my english as well (Translation by myself )