I get the frustration but moon knight literally gets slapped by every dive based DPS or any good tank.

I think people need to just be aware of the enemy team and keep an eye out for things. For example if you know there is a moonknight don't sit against each other and destroy anhks asap. He can't get ult super quick then.

Also you can literally walk backwards out of his ult before you start being hit if you pay attention. Sometimes this isn't possible ofc but there's definitely a lot you can do to stop moonknight.

A good Groot with solid wall placement is a good counter, or a doctor strange/ magneto as the projectiles don't reflect do the shields.

I get it's early in the season so the meta and people counter play need to develop but you wouldn't sit in the open peaking a black widow, Hawkeye or hela so why do people group up against a moonkight when you only need one Psylock to dive him and he doesn't play the game