RedDelicious

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As for "lack of emotion" some are claiming. She is a medical ninja. Just like a real world doctor who is trained to put duty before emotion, she is putting what needs to be done first. It's not like Karin who is thrashing out erratically out of pure emotional trauma or Hinata who gets emotional and trips giving up. She is the strongest of the three. She'll be emotional when Naruto is alive and wakes up. 
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It also helps that she had her meltdown in chapter 261, when she found out that extracting a bijuu kills the host.

She has had months to prepare for the possibility. She is keeping it under control right now, because it is necessary.

Some people are complaining how Zetsu was taken out by Team Orochimaru, but they only slowed him down, not stopped him.

I have a bit of that feeling as well, but did you know in real life, mouth-to-mouth CPR is actually not very effective in adults? The way it's suppose to be done is to simply push on the ribs.

Push on the ribs? If you mean chest compressions (on the sternum, not the ribs), that is already covered by Sakura doing direct cardiac massage. We can suppose that medical ninjas can increase the oxygen content of their breath, in which case her artificial respiration would be more effective than in real life.

As someone who had to do CPR on an overweight drowning victim reeking of alcohol and bad breath, it is certainly not romantic. 

But it does show Sakura's determination and strength in a crisis, which helps make her a worthy partner to Naruto (when NS does become cannon).

I wonder what Sasuke's role will be now that infinite Tukiyomi is about to be released.

Sasuke will be the one to break the jutsu.

Sasuke isn't happy unless he is miserable. That paradox will cause the happy world of Infinite Tukiyomi to shatter.