i'm going to be specific not because i'm making demands, but because i think "better" doesn't help people very much
i would like to see
- bigger scrolling buttons and generally everything to be designed so i very rarely have to scroll anyway
- the tech, spell research, diplomacy, dynasty etc buttons displayed on the main screen so they're always one cllick away
- consistent format for where the "close" button goes: sometimes it's at the bottom, sometimes in the top right
- unit cards that update to show what i have equipped. it's kind of lame that all my units are in armour but my sov can't be. and give me the ability to make my kids unit cards myself.
- a minimap that doesn't freeze on me. every time i seem to close and open the thing, or load a new game, the minimap is always showing a static old image that doesn't update (and the square doesn't follow my camera).
- completely redesigned spellbook. i like the icons and art style, but functionally it's abysmal. first the casting and research menus have different purposes and should be laid out totally differently. for research: have each page/screen represent one magic book and have all the spells within that book SORTED BY LEVEL. use smaller icons if that is necesarry to get them all on one page. consider a full screen interface. highlight each icon slightly differently depending on whether i know, don't know or am learning it. put the big icons on the right with the info for the spell i currently have selected as currently along with a button to toggle learning. then show the small icons of the spells i am currently learning at the bottom (independently of what book i have selected, along with my research production and other constants). for the CASTING menu, show only my spells known that i can cast in that mode (ie, don't show strategic spells in tactical mode), sorted by level or mana cost, and do this in a small transparent overlay, with a brief description appearing as tool tip (right click take me to it's entry in the research screen). consider making this automatically appear on screen when i select a channeler (for a great example see the nwn2 quick cast menu on the left of this screenshot)

in conclusion: research menu fullscreen with lots of detail and art, casting menu small ingame overlay, with spells in some kind of order.