Ppl seem to get this confused, itachi didn't beat oro with genjutsu. When itachi used genjutsu as oro tried to attack him so effortless, Itachi used genjutsu. However, Oro smiled and began to move his hands to release it but itachi cut his hand preventing him from doing so. Therefore, oro wasn't owned by genjutsu, as he was going to release unlike many others who were caught in genjutsu by Itachi.
Sasori, he's stronger than him, thats why Pain put him as the senior in the group...
Pain> Konan
Kakuzu>Hidan
Itachi>Kisame
Sasori > Deidara
Sasrori> Orochimaru
etc.....
You people randomly got the idea oro was immune to poisons? xD , there is no cure for all poisons....Oro is immune to the poisons that exist in Konoha.....Thus kakashi said
"The type of poison shizune taught you won't work on sauske, orochimaru would have made sure of it"
Also like any snake, he's immune to his own poison.....Thats alll......do you people think there is 1 cure for all poisons? Anyways, We all know paralysis is orochimaru's greatest enemy......Itachi beat him with it, and he was helpless......Oro hasn't shown any super fast feats, checked db it's 4.5, but that doesn't necessarily mean he's kakashi level....For eg itachi is 5 and raikage 5 also, are they the same? , I digress
He isn't dodging this , Out of jutsu in his arsenal I haven't seen anything he has to be able to dodge it..
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Now if orochimaru has edo tensei out, I can see himself potentially escaping it by using Hashiramas wood release,...but his control of them is shitty, and like hiruzen got the tags, they will get scratched by a puppet, and Poison does work on edo's(hanzo poisoning himself)...they will get paralyzed......and be useless