Many have underestimated the Sannin skills and abilities altogether. Many claims of Jutsu and Power shows you are not comprehending what it means to hold the name "Sannin" Kishi has created or is revealing to Fans of Naruto. Each one can hold their own against an opponent no matter the match-up so saying one is weak is a baseless claim or holds no arguement. Many example of battles is shown, wheather they were being defeated or winning the battle. However, as Tsunade is a medical ninja, she is shown less abilities in battle that make her not on the power-scale (Showing of powerful Jutsu) many of you that probably have put other characters.
Tsunade is not weak, strength wise. This was proven fact by Orochimaru and Kabuto, Jiraiya, even if comical, and Madara utilizing Sasunoo. Those who says otherwise is only in denial becuse no other character has this feat, besides Raikage, but was later surpassed by Tsunade.
Many have also question her skills and abilities because what? The woman who has done less, still has experience to out manuver and crush her opponents in battle. She even stated that her abilities was made to break the rules of medical duties and also, somewhat, for her to fight reckless. However, as Hokage, it was her resposibilty to protect the people so statement saying she cannot defeat Nagato/Pain is BS. Even with some info. Jiraiya was still unable to defeat all six Realms utilizing Sage Mode or barely even three Realms without.
As the underestimation continues and members BS about Fan this and that, thier forgeting about her skill and abilities that can take out at least one Sannin which is a possibility of being Jiraiya, Orochimaru is an lost, but her possibly fighting toe-to-toe with him does not make her weak, and others like "Power-Houses" such as Madara, Tobi, Naruto, Sasuke, Itachi, etc.
Basically, to sum this up, you all are making a big fuss or BS about nothing. Tsunade is not weak. Get over it. Also, about 'Thread Creator,' its your opinion, however, how many speak about your opinion has almost to no logic as to saying "Because She is alive and the other are dead, makes it so." You all have no say. Only Kishi has that power. How do you know they will be much stronger if they were alive? SMH