I rate them as being very businesslike in appearance. No they are not pretty, but they are not "badly drawn" either. I can actually think of several guns that are a lot uglier in appearance.
I think the main reason why the notion of Glocks being "ugly" persists is because of the reaction they received when they first hit the market. Back in 1986 they looked very strange, lying there in the glass case next to high-polished Colt Government Models and Browning Hi-Powers. But just as folks eventually got used to Elvis' "gyrations", times have changed and people are a lot more receptive to them.