His immediate presentation is bombastic and forward, sure, but his character actually has many layers and his development is some of the best I've seen in games, because (despite Laddy's protestations otherwise) you are shown, not told, how and why it takes place. Yes, Seymour's statements at Mushroom Rock Road are blatant (though he could hardly say beforehand "Oh yeah this isn't going to work we're just doing it to screw over the Al Bhed") but if you pay attention to what he does, what he says, and how he acts, Wakka's development is superbly handled.