For me, as annoying as the gimmick fights were, the really annoying thing about XIII's eidolons is that I HAD to endure these gimmick fights for stupid things I'd never, ever actually use. The description made them sound entirely too complicated and what's more they were completely superfluous.
But I was thinking I might give them another shot since I plan to replay XIII once I'm done with my current game.
But what about you all?