Its a wonderful game, obviously a lot of time, effort, coding and artwork has gone into it and it wouldn't be fair to give it anything less than a 5. However I have some suggestions for improvement;
Streamline buildings that require less resources into lower tier boxes rather than mixing them with higher resource buildings, it gave me quite a headache differentiating between what buildings I could buy and which ones I couldn't. (A yellow & red colour scheme might help, yellow for the resources I have red for the resources I do not have)
Create a morale bar or civil unrest bar so I can determine whether or not I will need to alter taxes or build improvements
Quests made no sense as to which ones are more difficult than others, perhaps a star system or difficulty rating would help. Additionally a more streamlined questing system that didn't require so much clicking for items I had no idea of the impact on success rate was. (A send all soldiers function would be handy as I wouldn't understand as to why you wouldn't just send everybody anyway.)
Create a max/min function for purchasing soldiers and a tier system as I didn't know which soldiers where redundant or even required for each task.
Leader system was confusing I just picked the leader with the most perks and used him frequently I didn't see the need to differentiate between any of them making a lot of the choice or gameplay redundant. (perhaps a leader purchasing option or minature RPG function to train leaders for better performance in battle.)
Most questing was burdensome aka all I did was max out my industry, civilian then economic buildings and then focus on questing. However questing seemed unnecessary as it cost more to produce my soldiers, then fanny around clicking relentlessly to send them on quests, to loosing soldiers for much less than the time and resources it toke to buy and send them. So the gain to loss ratio was mostly loss.
The things I would love to see is a glimpse as to the performance of my soldiers on a quest so I could strategize as to what soldier combinations worked and which ones didn't. And a nicely laid out quest system that complimented the city building aspect of gameplay.
I hope I wasn't to critical in my review, there is so much potential for awesomeness with this game I'm talking 6/5.. you know, impossible math :P thanks for reading and if you want any more honest opinion feel free to leave me a message :)