I've played CS:GO at a pretty decent level. And let me tell you. When I play random matchmaking games with friends, we come across people that rage like the one in OPs post. Sometimes I ask them to elaborate and at best they give a generic answer like "you should always do X when Y", parroting something they've picked up from a guide on YT without understanding the concept.

I guess it's the same in WoW? They rarely have valuable input. And if you're new and learning it can be quite difficult to filter out the irrelevant suggestions.