Have to agree, some brutalism can look very attractive, especially when its combined with nice large feature type glass windows. Contrete and modern glass can look extremely effective, especially when its surroundings – eg the gardens are well maintained. Just look up the Barbican Centre in London.
I actually think in some areas of Eastern Europe, they should install vertical gardens on the lesser maintained or lesser visually appealing concrete apartment complexes. I think it would totally transform the grey cities into something quite visually appealing.