As a relatively new player, and just now browsing the boards for the list of problems, what I would like to see is a list of things that don't work.
I have seen spell techs that don't work, (to bad I spent time collecting and getting the tech for spells).
I would like to see some documentation for what things are "suppose" to do, and what they really do.
I would like some idea of how things are suppose to work (mastering, non-masterable, Horde) in an official way. Not just word of mouth.
The biggest hurdle to this game is the fact that there is no readl documentation, the in game descriptions are useles, wrong, don't show up or misleading. The concept of a manual is missing.
There are quite a few techs, items, classes, formulas, buildings, components and more that do not exist in game, do not work, or have no description.
Looking at mind spells I hear Fog isn't working. Or food recepies are not there, or the highest tier components and forms are not implemented. And more.
Add to this no information about classes, abilities, races, buildings and more, and I wonder why.
Sure with a bit of effort you can find out "information" but then you have to validate this information yourself to see if that is real information or just conjecture.
Then there are quests. Classes without quests, races without quests (sure they are implementing them now) but wouldn't it be nice to know that I shouldn't bother with quests for a class as they are not implemented, done, finishable?
What I would like to see is something I can read to save myself hours of game time only to find out it doesn't work, or did in the past but not now.
Heck even a decent manual with descriptions of spells, forms, techs and where and when you can use them (yes, there are fan supported ones, but official ones).
That is my suggestion.