Magdeburg suffered terribly. One of the most heinous atrocities in a land of atrocities.
Yes, and there came at least a little bit of good out of it: the destruction of Magdeburg had been on a scale not seen since the days of Genghis Khan or the Albigensian War (in France), so much indeed that it was likened to the fate of Troy.
Thus, it was decided, when the war was over, not to fight to the last resort any more in the future, as had been done in the religious wars (of which the 30-years war was the last, at least in Central Europe).
And with this, the so-called cabinet wars were born (q. v.).
Sadly, the era of the cabinet wars ended with the French Revolution, proving that wars of ideologies are just as bad, if not more so, than religious wars.