NoirSuede : maybe because the notion of "good", "best", and "shitty" is subjective, and it's not because you don't like a map that anyone who likes it is retarded ?
Personnally, I like hightower because of its two big slopes you have to climb for each payload, wich seem to yell "You don't have to worry nor to hurry up ! No one is gonna move forward, so you can take you time and spawncamp snipers !". And the fact that there's no timer.
I like dustbowl and badwater, because, while not very equilibrated, they provide tons of strategic possibilities for any kind of player (except the sniper), but I don't like Yukon, mainly because it's ugly.