That's my point.
People are yelling about how the Titans are weak because they struggled to imprison the Old Gods - oh my god, the titans must be weak compared to them!
It would have been infinitely easier to just completely annihilate the Old Gods and move on - except, they fought them neck to neck and wrestled them down. We're yet to see a Titan at their full power. We're talking about beings with the ability to wipe a planet clean and completely reshape it. Old Gods are simply parasitic lifeforms.
THE TITANS WERE FIGHTING WITH RESTRAINT - is my main point. If they were fighting full force, Azeroth wouldn't even exist in it's current form.