my reasons are we have barely seen feats from her. she can barely take on plp like kakashi where other hokages have no problem with
her lack in jutsu
she hasnt shown nothing much impressive even konoharmu was able to take down atleast 1 pain while she was passed out from saving fodder ninja yea.. konoharmu!!!!!
and when it comes time to battle she hasnt shown nothing impressive ....
plp wanted her to be kage in part1 like jirayia but yet she has a fear of blood huh? a sannin being in the 3rd shinobi war? having a fear of blood:flaw: lol im kinda just ranting on now but you get the point
But thats the thing we have barely seen feats from her like you said. Her fight with Kabuto was exploited because he showed her some blood(which was weird because she's a medical ninja). But now that she's gotten over that we have yet to see her fight. She decided to give a buttload of chakra to Katsuyu instead of going to fight Pain herself. And that was probably the best thing for her to do in that situation as all of the Pain's were scattered. And she had to do something.