Those are political stories.
For me, the question of whether it worked is scientific. Did the people who proposed the stimulus correctly predict the future results of it?
No. Nobody predicted our current economy, and the prediction's accurancy get even worse if we're about to slide into another recession in the next six months.
Of course you can argue that what we did was better than some hypothetical. That's so easy that it's not even an argument, which is why I don't consider it. What I observe is that the economy did not react as expected, we have not recovered anywhere near as much as predicted, interest rates are still being held low and we're talking about them going negative (again, I recall no predictions that such measures would be necessary seven+ years later), and a wide variety of indicators that were supposed to turn positive never have, or just barely have, shortly before what is very likely a recession.
The theories aren't working. Their predictions don't come true. Given that the theories don't work, it is scientifically foolish to then use those theories to themselves predict what couldhave shouldhave happened if some other course of action was taken, since the theories are already visibly nonfunctional. It is circular logic to use the broken theories to predict that the broken theories told us the right thing to do. This probably goes a long ways towards explaining why economics is still the "dismal science". (Though, to be sort of fair, economics does not have a lock on that error.) I don't have to have a better theory to say that; I need only have predictions in my hand and their failure to come true.