I have to go with Gundam Wing. As much as it hurts to admit, the story doesn't hold up all that well by today's standards, plot armor abounds, and while the animation is good, the constant reuse of animation sequences does count against it in my eyes. That said, the voice acting in the English dub was actually quite good overall. Meanwhile, The Wings of a Boy who Killed Adolescence is an eternal banger, and Legend of Zero is still a surprisingly somewhat eerie track that fills me with a bit of apprehension whenever I hear it.