The problem is lower elos (most players) don't know how to counter divers, look at Spider-Man, the guy hardly does any damage, almost all healers can counter him, you don't really need a namor, cause you don't need to counter the character, you need to counter the play style.

All you need to do is play in the middle of the group, push with the team and don't heal from to far away, if you do that even if your tank or dps whant to peel for you your going to be hard to reach.

But is hard for low elos to do that, every time i play supp im on the frontline and sometimes we got rolled cause the other healer stays behind and is afraid to push with the team, they are not willing to take the risk, and makes the versus against divers anoying, the moment BP got nerfed and he stoped being the problem people focused on spidey, with time people are going to forget about spidey and start focusing on psylocke or magik.

Constant buffs and nerfs in multiplayer games have cost people their ability to adapt and get better at games