i feel i'm on a totally different page to you guys when it come to sasuke 
I was quite fond of his character development from him leaving the village to him reuniting with itachi and everything inbetween. It gave a good dynamic to the plot. It was actually when he turned 'good' that his intention are unclear and he started have more mood swings then a girl on her p---..... 
my problem with sasuke now is that he stopped being the irrational psychopathic hatred driven boy (who i found interesting) to this boring guy who has ambiguous motive and intentions. Why is this bad? because we need a character who will challenge naruto, not just in combat but also his ideals. To elaborate, naruto was given the task by jiraiya to find the answer to the conflict and hatred (which sasuke represents) naruto firmly believes that there is an answer and he won't give up. So i came to the conclusion that sasuke will be narutos greatest challenge in fighting the hatred the shinobi world produces.
The way the manga was built up i always thought sasuke would be the final hurdle for naruto and though this may still be the case, i feel it will be less exciting with the current sasuke then the previous crazed one.
when it comes to sasukes being responsible for his action, it''s a yes and no from me- yes because he made the choice in not carrying out itachis will. No- because he is also a bi product of the dark side of the shinobi world, i believe he represents sacrifice and the hatred it can breeds.
Another thing i disagree with is the time he actually turned dark side, i think he turned bad after he found out the truth about itachi. when he betrays orochimaru he was always clear on not to kill anybody demonstrating mercy and some form of compassion towards his enemies. After the reveal however he gradually started to loose it, plunging into darkness and driven by his instinct to hate. one thing for sure is that it's not as black and white as some people make it out to be.
I'm kinda annoyed sakura is literally watching from the sidelines, i want her to go in there and show people girl power (did i just type girl power?
) come on kishi let her fight some more please, i just love seeing strong women kick ass like a boss.
as for her smile, i don't think she's planning anything but more her not really believing her own words.
as for karin: i'm just no just no, i never really liked karin but now i really dislike her, it maybe just comic relief but there is a line. where's her self respect.
the kage: I'm NOT happy that they are all alive, i actually think tsunade and tsuchikage should have died because as of now madara had literally done nothing against the shinobi alliance, he becoming less threatening and more of a joke ( insert gay subtext here).
and finally kakashi and obito: its probably a genjutsu