I don't think the mk3 Prius looks that bad so it shouldn't be an issue if Toyota decide to use that design languge on other cars. Thing is, what might look shithouse on one model, may actually suit another model. I guess we'll just have to wait and see.
The design is a safety feature if you overtake one on the autobahn you won't have to have a look what good looking car you just overtook.
--> you can look to the front and avoid hiting the car in front