Yeah, he isn't getting talked about alot because of all the crazy big attacks and all the "big names" currently on the battlefield.
However, quote me when I say this Orochimaru IS going to surprise us. His vast array of forbidden Jutsu which we have not seen combined with Hashirama's DNA sounds scary OP to me. This guy has his arms back, he's not sick and we've never seen him truly go all out. The last time we saw him properly fight he was going toe to toe with a 4 Tailed Naruto without any of his Ninjutsu, without any Hashirama DNA, while sick and was still making a game out of it. He was smiling and laughing the whole fight.