4. Winston
Winston isn’t very good at protecting his team. His Shield Projector generates a bubble shield (think the Defender Titan’s bubble from Destiny) and allows allies to take cover, while still being able to shoot at enemies. However, compared to Reinhardt’s shield, Winston’s Shield Projector breaks very easily and isn’t great for defending against ultimates.
That said, his ultimate ability Primal Rage does make him a rather good distraction and using this ability will draw enemy attention away from his team. When Primal Rage is activated, Winston gets a HP buff and a shorter cooldown period for Jump Pack. This means his mobility is heightened, and he’ll be in a good position to start leaping at enemies from a larger distance and attack them. The enemy team will be forced to deal with him or risk getting shredded to bits. With his boosted HP, Winston can tank a lot of damage.
However, his tank capabilities only truly shine when he’s in Primal Range. Outside of that, he isn’t very good at absorbing damage for the team, especially if there’s a Zenyatta player on the other side.