Czestochowa apart from Jasna Gora is pretty ugly.
Wałbrzych are pretty depressing too
Walbrzych is not bad,it has lot of potential,just severely neglected over the years.
WROCLAW - definitely, anyone with half a brain knows that it's Wroclaw, Poland's embarrassment of a city
Wroclaw is considered to be one of the nicest cities in Poland,strange choice:/
My choice would be either Bytom or Zabrze,as much as it pains me to say it all Upper Silesia is mostly grim and depressing.