And the biggest thing that people argue for Brawl is that "there's spacing in Brawl." Spacing exists as well in Melee, and because it's faster, it's harder to space as well, and proper spacing gets rewarded better.
Plus, techskill just feels so damn awesome <3 Drillshine > JC grab > u-throw > u-air always just feels so nice on Marths. Or those people that say "LINK IS SO GOOD OMG!" and then you waveshine them continually.