Sanin > Itachi. Only person who we know was below Itachi was Orochimaru, and had big time to due with him not having his "normal body".
Plus, Itachi never "solo'd" Orochimaru. He simply caught him off-guard.
But the other 2 Sanin are portrayed above Itachi (Though i also believe Orochimaru with his normal body is above him). People act as if the Sanin were bunch of rookies, who haven't faced someone on Itachi's level... Sad and pathetic.
I mean the fact is that people have to limit Tsunade to simply taijutsu, taking out her ability of creating poisons and elixirs (which she was called the queen for).
For Jiraiya nothing is usually limited, but the scenarios are limited.
For Orochimaru, all you guys can do is post a scan of Itachi catching him off-guard.
On top of that most of you itachi supporters will act like the fight has to be face to face. Going against the characters themselves. X_X.