I'll grant you that the Scion isn't particularly beautiful, but to my eyes it can in no way compare to the overwhelming horror of the Aztek. I still remember the Aztek launch, where one was presented to the hapless Tiger Woods - who, with true grit, said, "Oh, wow - this thing is wild". That was probably about the only true thing you could say about it that isn't a direct insult to the designer...
That said, I'm told that the thing is actually quite a nice car - as long as you're inside it.
The only other true competition for the Aztek is probably the Chevy Avalanche, a plastic abortion of a pickup so awful it almost defies belief. It's like the bastard child of a truck, a power drill, and a frat boy's boom box. Ye gods.