I will explain my view on things.   
Everton Gazza 
http://www.caughtoffside.com/2012/09/29/video-everton-3-1-southampton-premier-league-highlights/   
1st goal, fine he can't do anything. 
2nd goal, what is he doing? He should go out and challange the player. Very bad positioning. 
3rd goal, he shouldnt have moved so much to the left. Hard to say that he would have saved the 2nd 
attempt even if he would have stayed though. And I'm not saying that Boruc would have either.   
Fulham Gazza 
http://theoriginalwinger.com/2012-10-07-video-southampton-vs-fulham-highlights-goals-premier-league 
1st goal, Hooiveld. Gazza can't do anything there. 
2nd goal, can't do anything about it.   
West Ham Boruc 
   
1st goal, hard to say really. Ball should never be allowed to bounce in that area and Boruc 
was ready for a touch from someone.  
2nd goal, defence should get there first. Had control over his goals position and would have saved it if it would have been on target. 
3rd goal, penalty is never the goaltenders fault. 
4th goal, what can he do?   
Tottenham Boruc 
http://www.youtube.com/watch?v=eToC-xY9_CY   
First highlight, Boruc makes a nice save. 
1st goal, Clyne makes an error and it is a nice header. What can he do?  
2nd goal, Challenges the player and get beaten. Made the right choice. If Clyne would have ran all the way back it 
might have been a whole other story.   
WBA Gazza 
http://www.jazayer.com/west-brom-2-0-southampton-all-highlights-and-goals/   
1st goal, he can't do anything about that one. 
2nd goal, he can't do anything about it.     
Swansea Gazza 
http://www.eplmatches.com/2012/11/10/southampton-vs-swansea-highlights/   
Only goal, completely Gazzas fault.   
QPR Gazza 
http://www.fullhighlights.com/2012/11/qpr-1-3-southampton-highlights.html   
Only goal, should have done better with it. 
Looked nervous the whole game.     
I can't say that Boruc has been great. What I will say is that he hasn't been bad in any of the games he's played. 
Gazza has been bad against Everton, Swansea and QPR. I'd say that we give Boruc a shot. 
Boruc is more composed and can command the defence, he did so against Tottenham when he ordered them to go  
up so he could shoot the ball forward when we were pushing for an equalizer.   
Boruc is an international goaltender and to choose a goaltender that really hasn't had a great game 
over him is absurd. Especially when Boruc hasn't been bad in any game.   
Ofc Gazza should be in the goal if he is the best goaltender, I however feel that he is not. 
This is my view on the case, sorry for the long post.