when i was little, we had one make a nest and camp out in my bike basket over the winter. my father was doing something in the gurage and noticed "the grey blanket" was breathing, and thought "hey thats not right!" and sure enough the grey blanket had fur and a pointy snout.

I don't think they are really 'ugly', but as long as they stay away from me i'll stay away from them and try not to hit them on the road.

I must say they are cute as babies:
http://www.abc.net.au/science/scribblygum/May2000/baby_possum.htm
http://countingsheep.typepad.com/jo/baby%20possum.jpg
http://www.wcsv.org/images/images2/xjoey.jpg
http://mark.zode.com/archives/baby_possum-thumb.jpg