1) I will go with the UI. I know technical-oriented devs tend to underestimate this aspect (look at Dwarf Fortress - deepest game ever, but the UI is a mess! Every screen controls and behaves differently). Consistency, ergonomy, ease of use - this must improve (I have a separate thread on this)
2) Difficult choices with lasting effect. All drama and tragedy is based on hard choices - will you save your wife, or the kingdom? Will you support the nobles, and turn the burgers against you, or vice versa? Will you accept state religion and opress the minorities, or refuse to do so and face the wrath of the church? FE does not have this
3) Sad to say, but FE needs to be more different than EWOM, which it is currently not. That is a disappointment for me, because I thought Brad understood that the disproportion of his satisfaction with the game, and the poor reception by critics and general public is because the game has critical flaws in the core mechanics. I thought, good, they are hiring Derek to design them a new gameplay core from scratch, and they will use the existing assets like graphics, sounds, and the mythology. But no, it seems that Brad's opinion is - the core game is fine, it just lacks some bells and whistles, so let's hire Derek to design more quests, more lore and more factions and we will be good to go.
It's true that I was playing the game only a few hours yesterday, but these are my impressions. Please understand also that these are my personal, subjective opinions and they represent only my self. Maybe I did not understand something, maybe there is a silent, very happy majority who is completely happy with the game. All is good then. Or maybe there isn't...