I dont know why Dormmamu loses to Dr Strange probably because of magical rules, if he knows alot of magic rules then Odin and Zues probably know even more so then Odin and Zues probably would win.
If they just meet and start fighting the Dormmamu alone would win because he has fought with Eternity and held his own.
http://www.comicvine.com/forums/battles/7/dormammu-vs-odin/565291/?page=3
these feats provided here are far beyond odin
Odin and Zeus have this.Dormammu is considered a peer to both Odin and Zeus.Surtur on the other hand, needs Twilight in order to challenge Odin.And even when Surtur had Twilight, he was still struggling to beat Odin until he tapped into the power of the Casket of Ancient Winters to freeze him.Surtur w/o Twilight was always punked by Odin.And in the Fear Itself arc, we've seen Zeus actually manning up against Odin.That alone speaks volumes that Odin and Zeus are equals.Surtur w/o Twilight is the weak link in team 2.Dormammu alone wont be able to handle Odin and Zeus once Surtur is out of the way.