I think you gotta remember, that its not how well it does in the US that determines its popularity, but how well it does in Japan. I will say that Gundam Wing is was got me interested in anime in the first place. However, if I remember correctly Seed passed Wing in popularity in Japan. I think the reason Wing was so popular in the US was because the characters were such hardcore badasses with no faults whatsoever, whereas in Seed, I don't think there was a single episode in the series that didn't feature Kira Yamato crying. There was at least SOMEONE crying in every episode, and I don't think a single tear was shed in Wing. IIRC Seed didn't even finish its maiden run on Toonami as it got pretty bad ratings. I will agree that Destiny isn't anywhere near as good as Seed.
Oh and spluk, that link you gave had Destiny, but it was just original Japanese dub with Eng subs. Not what I was looking for but thanks anyway.
