Get it out of the way first that I still hope RJ will return but I won't dwell on it....
Personally I think the last few episodes (barring last nights) were pretty average, PJ seems to be disinterested in what's going on and just seems to be drifting through episodes and Lisbon's new role as guidance counsellor for the FBI is quite tedious, however I do believe it could turn a corner with a regular character death. Unfortunately it may have to be an unpopular choice like Rigsby or Van Pelt, as there has not been enough character development of any of the new characters for us (or PJ) to care. Hopefully this will turn PJ into the driven and goal orientated lead character of old that kept everyone's attention for 6 Seasons, 8 episodes and 35 minutes :D
