Easily trio'able by a MNK/WAR, NIN/BRD, and WHM/SCH.
It's rather laughable honestly, you would only need to keep your white Mage out of range and then when Odin goes down to around 5% before his 10k attack, have the MNK disengage and the NIN will tank with Migawari. This coupled with boss weapons will guarantee a fast kill. The NIN needs to /BRD for Finale to get rid of Odin's Dread Spikes, that speeds up your kill. and right after Odin uses his final 10k attack, the MNK needs to pop Berserk, Impetus, and Hundred Fists and hammer Odin before Zantets can go off.