A lot of context is missing from that quote. I'm pretty sure nobody sane have ever claimed this is great art. But perhaps quite good for an amateur. Only the buildings really works in the paintings, the rest looks like crap.
But he seem to be quite competent at drawing architecture, which is also what the Vienna school told him.
> I'm pretty sure nobody sane have ever claimed this is great art.
You would think the same was true of https://en.wikipedia.org/wiki/Four_Darks_in_Red, and yet...
Have you seen the Rothko in person? It is a large work with deep color that doesn’t reproduce in photos displayed on computer screens.
But of course he was a Bad Man, so he cannot be allowed to have any good qualities, therefore his art is bad.