Worst leader of the PUWP?

I got the idea for this thread from Pennboy, who started a thread about the greatest Polish king in history. So, I thought talking about Poland's communist years would provoke some interesting discussion and insight. So, here it goes. Who, in your opinion, was the worst party leader of the PUWP and why?

Bolesław Bierut
Edward Ochab
Władysław Gomułka
Edward Gierek
Stanisław Kania
Wojciech Jaruzelski
Mieczysław Rakowski

None of them was a leader. They were all Russian puppets.

But if I have to pick the worst, I would say Gierek is the one who took most most credits (and spend them on consumption). Paying back the credits slowed down the country's growth after the Round Table. And Bierut has the most blood on his hands.

Without a doubt.