Frustrated in not my feeling, as it was expected, they didn't do anything about most of the issue for long time, some of them were fixed with lazy solutions. Now that they are selling the complete edition and didn't launched any update in the patch, I'm confident they will no do another patch.
There are many issues that would be great to have (my wish list, yeah):
- Policy balance: Tradition and Rationalism are uncontested options.
- AI falls too much into the culture game with piety/tradition/aesthetics.
- Excesive warmonger penalty.
- More mod love: unlock most achievements with mods on, MP support for mods.
- Early-Mid Ranged and should somewhat toned down, also city strength.
- Gold curve is broken, as you can fall into red numbers without army at some point early (unless you play God-Tradition).
- Rework of the plegde to protect system.
- Rework the diplomatic victory.
- Fix AI combat, witch is not able to move and shoot with ranged. AI isn't able to properly use naval units, nor air.
- Fix unit promotions when unit changes type on upgrade (Horse Archer -> Knight as example).
- Fix graphical bugs when removing a road or finishing a farm is not showed correctly until reload.
Sure there are lots more, I don't have in my head right now.
Hell, with little work the can fix so many things... I guess they just don't want to spend resources on it. We are done for.