Sorry but this thread is kinda fail, no bitchiness included.
Tsunade: Best kunoichi in the Narutoverse, half Uzumaki half Senju, tremendous raw strenght enhanced with chakra it becomes brute strenght, best healing techniques, made the medical system in the ninja wars, unparalleled when it comes to medical ninjutsu. Katsuyu. Able to heal an entire village isn't kage level to you? Show me anyone who can do that.
Orochimaru: Great ninjutsu, master of several ninjutsus as he wanted to get to know all of the world tecniques, sword of Kusanagi, Manda.
Jiraya: great taijutsu user, teacher to 3 of the best generation of pupils (minato, nagato, naruto), mastered Rasengan, Sage Mode, extremely intelligent when it comes to collecting data, fought almost one of the most feared Shinobis in Narutoverse, being one of his pupil, not even being in his prime.
So, no, they both stand up to their names and are well ballanced.
Legendary Sannin means the Legendary Three (as San means three in japaneese), 3 legendary ninja who were able to survive the most feared enemy from Narutoverse at that time. Up to now their skills are unparalleled. Excluding over-powered Naruto, Sasuke, Madara. (As a matter of fact we're seeing Tsunade kicking Madara's ass at a point)