This is like people who said that people couldn't know that the shield around a enemy castbar means that you can't interrupt the cast while tips in the loading screen tell you exactly what it does.
I don't think everything needs to be in the middle of your screen in big red letters because some people are not bothered to read a tooltip or tips in the loading screen. When you read "You have 0.96% to miss a level 93 mob" when you hold your crosshair on your hit rating it is very obvious that you have to increase your hit rating to not miss.
Some people simply don't care, so be it. I don't think that's the games fault. When you do care it is simple to figure it out by yourself with all the information given to you in the game.
A screen tooltip is hardly the most helpful way to tell the most casual player a single damned thing :x I can't seer how a person would think that's at all intuitive.