Magus has no Dual Techs and little interaction with the party once he has joined. He has little synergy in battle and interaction, a stark contrast from the rest of the team, whose communication and inter-party relationships make them so great.
I actually loved this. Yes, it diminishes his usefulness ever so slightly, but it fits with his character: Magus is a lone wolf who prefers to do things his way, and having a bunch of Dual Techs with characters he's been fighting most of the game would seem out of place. Besides, he does have a handful of awesome Triples!
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http://www.youtube.com/watch?v=SBpfwpOPXNc&NR=1&feature=fvwp
~Pinkie Pie is the best pony~