mountain_tiger
Smash Champion
Melee players probably avoid her in Brawl because she sucked in Melee (the same reason why not many people play Bowser in Brawl).I still don't know why more people don't play her
Otherwise, it's because Zelda has some pretty fundamental flaws, arguably the worst of which is that her aerials are completely unreliable. Yes, Fair and Bair are super strong if you sweetspot, but if you don't, they can attack before you recover. SH Nair sort of works, but that soon gets predictable. And Dair is useless if your opponent is on the ground. Not to mention the fact that people are starting to get around things like her USmash.
But really, probably the main reason is because she gets utterly destroyed by MK and G&W (and maybe a couple of other top tiers as well).