Fat lot of good it did. The houses were pretty much all "yeah, yeah, okay, whatever," and fell back into infighting not long after the events of Morrowind.
threw down the triumvirate
With the help of Azura and Vivec themselves. Both Vivec and Sotha Sil knew their time was up and let it happen. Almalexia only opposed it when she went insane after the fact.
gained the favor of many Daedric princes
The CoC gained favor of more Daedric princes, and was given more note-worthy tasks (travelling to a Daedric realm for a tournament, travelling to a Daedric realm to free trapped souls, slaying Umbra to get Umbra, slaying a unicorn and ostensibly eating it and drinking its blood, starting a war between two families...).
Note that you did not kill Dagoth Ur. You killed his body, twice, but he was still alive as a god and could come back again. In fact, you didn't kill Vivec either, for the same reason (if the Trial of Vivec is to be considered canon). The only one you killed was Almalexia after she lost her power.
defeated an aspect of Hircine to top it all off
The CoC defeated a Daedric Prince full on,
in his own realm.