The trouble is, no matter how lofty or noble his ideals or goals were at first, Gaius lost all credibility the moment he allied with Lahabrea - he zealously hated the Primals and wanted to conquer Eorzea to destroy the Primals. So, what did he then go and do? Team up with the very force responsible for giving the beast tribes the ability to summon the Primals in the first place.

Personally I felt this actually cheapened his character, in that his drive and goals were no longer his own, but simply the machinations of the Ascians. Which is a shame, as I actually liked him as a character, even though I hated him as well (as a result of role-playing my character and her back story involving Ala Mhigo).