Wow you seem to be underestimating them. Let me walk you through the story my friend. Now we all know orochimaru lost to itachi, but was he really trying to fight itachi. the answer is no, he was trying to steal his eyes, just fail because itachi caught him in tsukoyomi. Mainly itachi was using a cheat code where orochimaru was using his ordinary snake jutsu. And let's face it, itachi only have two power in his arsenal that can take on orochimaru, and orochimaru has a vast. tsukoyomi and susanoo are the two that could take him, amaterasu wouldn't work because he can shed his skin. And there are only two or three people who can take on orochimaru in the akatsuki. Itachi, Pein, Tobi rinnegan. Sasuke killed him for plot no jutsu. Come on man we all know that was going to happen in order for sasuke to live, and the story to continue, so he could fight itachi. So you're saying orochimaru full power before his fight with sandaime, sasuke would still beat him, even itachi if not for mangekyou would lose and die. you're talking about a man who went toe in toe with the four tailed naruto and was playing around while he had no hands. and remember he's half immortal, he's still lives in the story inside kabuto and is one of the main antagonist, don't sleep on him.
Now Jiraiya, you're underestimating a guy who took 3 bodies of pein without knowing any of their secrets yet. And Pein even said that's something that was never done before even with hanzo, and if he had known of their secrets, Pein could have lost, Pein stated. Most akatsuki member wouldn't even be able to accomplish such feat. And you said 3 of his weakest right. Now let see one who could use summoning jutsu important enough that the human path had sacrifice himself to get him/her out of the way, the human path specializing in taijutsu, and preta path. Now tell me how many of those strong shinobis of yours can take on summoning jutsu, while fighting a taijutsu master and pretty much your ninjutsu won't work, and oh yes fighting the rinnegan, the most poweful eye in the narutoverse. Without any proper knowledge of it any shinobis would lose even minato and the rest of the kages. And those three weakest took on the most powerful village by themselves and three others. Itachi even stop kisame from fighting him, saying that the fight could end in a stalemate or worse. And Kisame acknowledge him as the strongest.
I don't know much of tsunade, not much has been shown yet, but she is strong. Even orochimaru said so, and she is world renowned as the most powerful kunoichi. Now think why would Kishi say that. And we know she would pawn most of these akatsukis with low to mid-difficulty. With her lack of development, she still is frightening. She fought Kabuto, orochimaru and manda at the same time. She messed orochimaru up, and disabled manda. Her taijutsu top-form. Able to do flip while inthe air. she grabbed kusanagi sword with her feet while being dragged in the air. One punch kill or bone crushing. Amazing chakra, able to heal a whole village filled with ten of thousand people.
So don't underestimate them man, it seems you still do not understand the meaning of being strong, they are probably in the top ten strongest in naruto.
I advise you to review what you just said, because it seems like you know very little of them.