Another thing is that the chance of success itself doesn't seem terribly high either. It is worth remembering that rage gives an advantage in strength's checks (it should facilitate throwing enemies).
On a stream, even in active rage, the chance was quite low and amounted to around 65%.
The highest of what I have seen is 70% and this is only in the case of very light skeletons.
The fact that the percentage chances don't change while raging is evidence that Throw is based on an attack roll, not a strength check. Which is it's own problem. But it also means that having Advantage on attacks - not that hard to get, and more easily obtainable for non-barbarian classes - will turn those 65-70% chances into 88-91% chances.
And more importantly, the % chance displayed is the chance to actually hit the enemy with the thrown enemy.
It seems to be a 100% chance to pick up and throw an enemy. (basing on what I saw on Stream and @Niara's Throw Wizard investigations way back).
