It seems that Leona, Blitz, and Thresh as a sort of distant third a far superior to all other supports; considering someone's ability to play all characters are equal. Also no marksman want apc support from someone like a Brand or Xerath. I just mention that while still fun it is making things considerably less interesting and more repetitive.
MrPerson101 votesAll of them are tanky enough to withstand some damage, provide some burst and CC. That's why they're used, same reason Morgana is used, not because they're brainless champs.
Power Cosmic1 votesMorgana isnt as near as effective as Leona or Blitz. It isnt close. In ranked teams one will be picked guaranteed if not banned. The only counter is shielding adc with your body as a tank.