I think they look alright. Maybe a little bit childish in some aspects but it doesn't bother me. I like the fact that they neither look like japanese manga characters nor like american comics heroes. They have some "neutral" quality to them that I find cool. Some of them make bad hair choices, though.. but better that than everybody has the same hair!
"Air is beautiful, yet you cannot see it. It's soft, yet you cannot touch it. Air is a little like my brain." - Jean-Claude Van Damme