hello guys, it's me kooko & i am huge sakura & tsunade fan in NB :hey:
i want to talk about my favourite characters (sakura & tsunade) and i want to explain why they are so underrated
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i admit that sakura was weak in part1 but in (shippuden) she became really awesome character in so many ways
1- she trained under 5th hokage ..
2- she beat sasori
3- she helped to heal kankoru
4- she destroyed pain's summon with only 1 hit which even jiraya's great summon couldn't do that
5- she discovered white zetsu & smashed him with one hit & without her healing nobody will survive in war and we will see more death .
and all these great actions from sakura, i found some members dare to call her useless :flaw:
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she's awesome from part1, even in part2 she's one of the top10 shinobi of all time & that's in my list 
1- she's the only remain from sanju clan (the strongest clan ever lived)
2- she's the strongest hokage after 1st hokage ofcourse .
3- she's the strongest sannin that's why she become the hokage .
4- in databook, her power is 35 which is highest score i have ever seen
5- she's best medicail ninja ever lived and sakura is 2nd ofcourse ..
and after all this , some members in NB said , she's weak & they underrate her and they forgot that she's one of great characters of all time :flaw:
finally, stop underrate sakura & tsunade because they are great characters with so many potienal and without doubt they are best female characters in the series and thanks for reading
im going to go through each point you made about each character
Sakura:
1. yes she did train under the 5th hokage, whats that suppose to prove?
2. she didn't beat Sasori by herself Lady Chiyo helped to call 70% to 30% ether way is ridiculous it was a team effort, and without the other they both would have died somewhere in the battle.
3. she did heal konkorou very quick and effient, very impressive.
4. If i remember correctly she snuck up on it while it was busy chasing a little girl.
5. anyone can one hit a zetsu its not that hard, and it the most recent chapters i havent seen sakura heeling much
Tsunade:
1. I don't how that makes her strong, with that logic Sasuke is only strong based off of being the only uchiha survivng the massacre.
2. No tsunade is not the 2nd strongest Hokage she is like maybe 3rd or 4th best.
3. No she did not become hokage being the strongest sannin she became it because orochimaru is a missing nin, and Jman turned down the job.
4. Look harder.
5. Probably
Conclusion: while most of the stuff you said about sakura was true enough, you defiantly overrated Tsunade, now im not hating on her she is a good medical nin and has great strength she just doesnt live up to how you described her.