Need tutorials of sorts, to teach people that don't catch on very quick how to play their toons! If there was a broader in game knowledge base that people could tap into, giving a better description of their toon's spells/abilities and the general purpose of said abilities! I am of mind that something like this would result in less QQ about raids & dungeons being too hard, thereby reducing nerfs, and making the pool of good players much larger in which to recruit from!
I understand there are people that are just bad and no amount of info will help them because they are not willing to help themselves but for those who just don't know and are afraid to ask much for fear of being flamed something like this would be great! If for no other reason than the info is right there in-game and there isn't the need to go to a 3rd party theorycrafting site to learn the do's and don'ts of you class & spec! New players don't necessarily know that you need to go outside of the game client to get the solid info on your toon, and don't want to ask about the how,when, what&why for fear of being torn apart by cruel people that we all know are all over the place in WoW now-a-days!
In conclusion, I point out my sig., and hope that something like this would work toward curing the ignorant, while nothing can cure the stupid!
Ignorance can be cured through education,but Stupidity is chosen ignorance!