The character I hated the most,by far,was Kevin Finnerty. I never got the point of the "coma dream" world in which he existed.
I know that Chase liked to leave some plot lines unresolved(the Russian,Furio and Finn's departures,Sil and Tony's eventual fates,etc.)and for the most part,that was a feature of the show that I liked.Real life is like that,not everything gets wrapped up in 60 minutes.
I just feel that on occasion,IMHO,Chase got a little full of himself and just threw stuff in because he could.