It seem I'm not the only one assuming.Let me asked you this, what happen if Muu instantly disappears when he senses Itachi coming? Then what.How would Itachi place Muu under genjutsu when he can't see him?How would Itachi place Muu under genjutsu if Muu Fly in the air while invisible and uses dust release which can cover the length of a mountain top? We all n=know muu is a sensor shinobi, so he can sense other shinobi and justu being activated.
As for The Third Raikage, what happen if The Third Raikage immediately activate his chakra going into his superior speed and hitting Itachi with his One-Finger Nukite.Or lets say the
As Hashirama you called what I said, but at least their are fact in my words.And stop saying instant amaterasu, it sound so stupid.Also, let me educated you.Madara has shown these abilities,Amaterasu,Susanoo,Tsukuyomi,Yasaka Magatama and Fire release jutsus since his appearance in the fourth shinobi wars.Can you think of another shinobi who has those abilities? Let me give you a hint, It rhyme with yachee.Furthermore, all of madara abilities in those areas where on a far superior level than Itachi's except for tsukuyomi, since we didn't see the sclaes of Madara's tsukuyomi and maybe susanoo because of the ideas Itachi susanoo has.Madara fire jutsu were stronger than itachis, his Susanoo was able to fire far more Yasaka Magatama than Itachi and hsi amaterasu was as powerful if not more.Maybe Itachi's and Madara battle style are different, but there jutsus aren't and Hashirama defeat Madara who skillls and power far exceeds anything we have seen from Itachi.Saying the kyubi was on the battle field means nothing because madara brought it and we don't have a clue how it was used.So I can easily say Hashirama simple took control of the Kyubi and had Mito seal it within herself can continue to battle.Saying Hashirama is just high is silly, seeing as we have haven't seen Itachi take on any Kage level shinobi.
As for the Third Hokage, the third was said to know all the jutsus in the leaf, so I can assume that Hiruzen in his prime could have found a way to deal with one genjutsu.And stop using saying all of Itachi's genjutsu like he has some variety, he uses tsukuyomi, that's it.Now my case for The third hokage is just hype because so little was shown of his abilities in the manga.But, hype must have some truth and Hiruzen was consider the stronger hokage.
To summed this up, I think many shinobi can win against Itachi, but one Shinobi I know would win is Hashirama.I'm sorry, but anyone who thinks differently is a moron.Madara who possessed the Eternal Mangekyo Sharingan, a superior sharingan to Itachi's and had far more battle experience then Itachi, seeing as he live in a constant time of war lost to Hashirama.I don't think anyone who reads the manga and has seen the power and skill of madara can disagree.It may be hype, but what is Itachi without hype.We haven't seen Itachi take on one powerful opponent.And I don't count sasuke.So unless someone is willing to show me Itachi skills in battle with someone of madara's level, he can never beat Hashirama unless in a game of who can cry the most blood.
I might be wrong, and am open to being proved that way, but has Madara used Tsukuyomi? Or Amaterasu? I have only seen Susanoo, but again that could just be me.
Secondly, Madara has a superior sharingan to Itachi? Maybe in terms of modes, but that might be a little bit of a leap considering that a 16 year old Itachi was more than powerful enough to join Akatsuki and defeat Orochimaru, let alone his clan.
Also Itachi has the Yata mirror and the Totsuka sword, which makes all the difference in the world.
And lastly, Madara has shown no genjutsu feats. Not a single one. Itachi was recognized as the only person who had the chance of controlling those Zetsu clones (back when they thought it was genjutsu). They didn't say, "Oh it could possibly be Madara Uchiha", they said it could only be Itachi.
Also you claim that Itachi only has one genjutsu, which is Tsukuyomi. Again you are misinformed. Tsukuyomi is just his most pwerful genjutsu. He also has his crow genjutsu, whatever genjutsu he used to trick Deidara into almost killing himself, his genjutsu that he used on Orochimaru when he was turned the other way, and his reverse genjutsu which he used on kurenai.
Secondly Madara may have had more experience than Itachi, but not that much. Yes he lived in a war torn era but who was the only clan the Uchiha really fought? The Senju. Fighting one opponent over and over doesn't really make you better it makes you complacent. Itachi was an ANBU captain and joined Akatsuki at 16, so yeah I think he has seen his fair share of battles. Also he is clearly very intelligent, whereas Madara hasn't shown all that much intelligence yet, just brute force. So experience doesn't really factor in here at all.
About the third raikage and Muu. The third raikage is obviously slower than A, although he is much more durable. Dodai was able to dodge him, and SM Naruto made him hit himself so yeah a speed blitz is not happening to Itachi. Do you know why? Because Itachi is faster than Sasuke and Sasuke was fast enough to fight evenly with A in his version 1 raiton armor. The raikages move in straight lines and are thus super easy for the sharingan to track. So the third raikage's only chance comes from a speed blitz, which is just not happening. Especially since as you seem to forget, Itachi has started literally every battle with genjutsu.
Dust release would be useless against Susanoo because of the Yata mirror. It would have no effect. Muu's only chance is if he goes invisible, and it has yet to be seen if one of the three dojutsu can see him, since he has not gone up against any yet. Also he lost to a genjutsu user, so that is an argument in itself for genjutsu.