This is situational. If the Raikage knows not to look into his eyes he should be fine. In a stand off opponents tend to look each other directly face to face. We know Itachi goes for genjutsu's very early in his fights and he catches people in them before they even notices it. Bee vs Itachi, Itachi caught Bee in an genjutsu even though Bee knew Itachi was an Uchiha(he even fought Sasuke who caught him in one). Sasuke caught Danzo in a genjutsu multiple times and Danzo knows NOT to look sharigan users in the eyes directly. He can also cast genjutsu through shadow clones. I don't know if his shadow clones can cast MS techs though.
Good Post Zato. Every Ninja knows the Sharingan posses the best Genjutsus not everybody knows that's it's an instant catch with skilled users via eye contact. Now ninja that even know not to look into their eyes still get caught because it extremely difficult to fight somebody without looking at their upper body. Only gai is known to be succesful at this because he spars with Kakashi he's had years of training.
The 3rd Raikage's 1finger lighting jutsus can maybe pierce Susanoo's shield just a little but nothing to destory it. Itachi's Susanoo withstood Sasuke's Kirin which destroyed a Mountain, raikage's finger jutsus can't take down a mountain 1 feel swoop. And Itachi's Sword of Totsuka can be stopped by his lighting armour but not repetitively after 2-3 swings he's getting sucked up in that sword......
Everybody says Itachi doesn't have a lot of chakra where the hell do you guys get this from?!?! Itachi walks around with his Sharingan on auto-pilot that's chakra constantly burning but the amount must be very insignificant for Itachi. After 2 Tskyumoi and 1 Amaretsu Itachi turned off his Sharingan pre-time skip M.S thecnique's are shown to burn chakra and result in you losing your sight after each use, with that being send Itachi had to rest his eyes but he was not OUT of chakra. He then tied an arm around his back fought Sasuke after taking chemotherapy and over exerted himself so he died...metaphorically thats what happened....So how are his chakra reserves low?!