Hes bad very bad not even worth 10 seal scrolls i dont use him at all . ;P
Well first of all i got him from a free pull second i didnt ask if he was good or not i asked if anyone knew how the game decides how much dmg he does.
The summoned Hashirama basically uses the same standard and chase as the actual ninja. He sets up his barrier as soon as he's summoned. I"m not too sure if his passive works as well, it's been a long time since I used Oro Traitor in pvp. This Hashirama still deals quite a lot of damage, though.
He's great for ranked, if u dont have sound ninjas with him, and as long he's alive, he can summon hashirama and tobirama, i got to a ranked, at one point i was fighting vs 2 hashiramas and 1 tobirama LOL
People think he got nerfed in the 2.0 update, but he just got changed. Oro KT NEEDS Kabuto in order to be used effectively now, but he also got a buff where a summoned Hashi will proc his attack and immobile 2 ninjas the turn he is summoned.
There's better ninjas for main teams, but he still is a good RB ninja, especially mid-game as @Yuusuke mentioned.