Agreed. I don't think any of the monsters are OP as long as you have teammates who know what they are doing.
Just like you said - spreading out, medic staying out of combat, using the map to track, etc. There are quite a few small things which people don't pay notice in the game that helps them keep up with the monster (or hunters)
I think this is the big part. I was working from home today and had some streams on interspersed with some playing and there were just some mind bogglingly bad players on the hunter side.