When Winston succumbs to the torture and accepts his place in society and love for Big Brother, does that change of heart seem sincere?

This
answer is definitely going to change based on individual readers.  Yes, I think 's love of Big
Brother is sincere.  I don't believe that Winston would have been let go unless his feelings
were sincere.  In ,asks Winston how he feels about Big Brother.  O'Brien says that he will know
if Winston is lying, so Winston tells the truth.  

"Tell me, Winston -- and remember, no lies: you know that I am always able to
detect a lie -- tell me, what are your true feelings towards Big
Brother?" 

"I hate him." 

"You hate
him. Good. Then the time has come for you to take the...