While I agree with the criticism comment.
The larger problem is people can't give criticism "constructively". Or even how to ask for help constructively.
Saying "WTF No ganks top! U Fcking NEWB!", is status quo for how to ask a jungler to gank these days.
As for criticism, what people actually write is too outlandish to type, but her's an example of how to helpfully criticize:
You could say, "Please stop feeding top." This is acceptable, but still inherently negative, and says nothing of how to fix the problem.
You should say, "Please stay at the tower and play defensively until we catch up," A positive yet direct statement to the problem.
Requesting a gank can be as simple saying, "Need help top please." Guaranteed 50% better change jungler makes a be line towards top lane.
As opposed to, "No ganks, u fck! Gank top!" 50% greater chance jungler moves to next minion camp.