Nah, he wasn't invincible to some ninjas stronger than him and Susanoo can be bypassed or beaten by some jutsus like Jiraiya's swamp of the underworld which a 30% powered based Jiraiya used to make a swamp about large enough to sink Susanoo
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, chakra arms that can go from underground
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(Naruto does have Kurama and other Bijuus to aid him in strategies and he can switch with Kurama as well), Kisame water dome
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(Itachi can't breathe and Susanoo's movements would be slower in the water while Kisame would be faster).
Gaara's Sand
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(Manga fact that he can make sand from the ground by breaking down the minerals), Kakashi/Obito's Kamui (the one Kakashi had but now that he lost it, idk who I should say have it) is strong enough to take off an arm of Gedo mezo and it can be aimed at Totsuka's gourd which is where the blade comes out of or use on Yata mirror and since it's not an attack but a space/time jutsu that warps, it will work. Obito's Kamui which warps his body to another dimension, can bypass Susanoo and Yata mirror since it's not an attack and the physical body isn't even there, Yata would have to be in the other dimension to do anything.
A combination of wind cloud to hide your whereabout and frog song where Yata mirror isn't facing (sound does get thru Susanoo as Kabuto's sound genjutsu was used when Itachi and Sasuke were in their Susanoo and upon being caught, their susanoo deactivated) would be either Naruto, Minato or Jiraiya in SM, Kabuto can use white noise to blind Itachi while his sound genjutsu stops him or he can control the surrounds to attack from below. FTG, tag Susanoo and FTG inside (they can FTG a couple feet from their markings), Sasuke's S/T jutsu can take him inside, Hashirama/Yamato's wood jutsu can surround Itachi from underground
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