Could you link to the page or passage? Merrish(Save for Dunmer) perspectives will likely classify him as evil for tricking the aedra into creation.
Oops. Sure that might be important.
http://www.uesp.net/wiki/Lore:Dagoth_Ur:
"Since Dagoth Ur worked in accordance with the Heart's natural evil, rather than against it as the Tribunal did, he grew stronger as the Tribunal unwittingly grew weaker.
"http://www.uesp.net/wiki/Lore:Almalexia_(god):
"Together, known as
Almsivi, they achieved great heroism with their divinity, but it was also their undoing; because they worked deeds of good against the evil of the Heart they were weakened even before the return of http://www.uesp.net/wiki/Lore:Dagoth_Ur, Nerevar's nemesis."
http://www.uesp.net/wiki/Lore:Sotha_Sil:
"They achieved great heroism with their divinity, but it was also their undoing; because they worked deeds of good against the evil of the Heart they were weakened even before the return of http://www.uesp.net/wiki/Lore:Dagoth_Ur. Dagoth Ur, who had also stolen power from the Heart, acted in accordance with its evil and grew stronger."