I personally never thought the cube was too ugly. I hate the box theme, but compared to the other boxes like the scion thing, I think the cube looks the best. The old scion would probably be my least favorite.

The ugliest car out now in my opinion would have to be the aztec.

There's also the one truck/suv/crossover thing, but I can't think of it's name now. It's the one that is nearly shaped like the box, and always has the white top no matter what the rest of the car's color is. Not horrible looking except for the paint. Just can't think of the name of it right now.