Having been to Torun, Warsaw , Wroclaw and Cardiff many times they can all be great events, more so the fuller they are. I sense the argument here is really about the ability to provide a track that consistently enables exciting racing and somehow the Polish tracks seem able to do this more often - although Cardiff does occasionally through up a great meeting. However, with the technology and data available today I am surprised no-one has managed to fully solve this problem for Cardiff which as a man-made track inside a stadium is presumably able to be the same shape as Warsaw (I am assuming you want many lines through every bend, but I am no track designer).