Hm. I'm kinda surprised that they nerfed the normal Ocean Dragon but not the Ocean Dragon Soul.
Like, I got that one twice and it becomes almost impossible to die. In one game I just stood and facetanked a Aatrox as Lux healing more than he did with his ult popped. (The Aatrox wasn't feed or ahead but still the healing was really nuts and we just hit each other till his ult ran out and he eventually died unable to kill me fast enough trough the regen)
The other Souls seem fine to me; strong yet not "Game-over broken." But with Ocean Soul you just don't die unless you get super focused and burst down making ot almost impossible to lose teamfights. But don't know, maybe thats just me.