If People are willing to buy Chery and great wall. Its case in point people don't give a crap about the looks of the car, its about a competitive price point that will attract buyers.
Which WILL be rather difficult in my eyes as they are battling an extremely well established brand (VW)
As vectracious said, they'll have to advertise advertise advertise, do some decent P.R stunts around town and get people test driving cars.
Opel Did confirm that they'll be attending the Sydney 2012 motorshow, so a quality start from brand awareness.