Just scratching the surface of the game so far but:
1. Keyboard remapping.
2. More information in the UI - a lot more
3. Still thinking, probably a lot more detail in the campaign
re: #1 - I'm playing on an m11x laptop, and half the camera controls are unavailable because I'm not playing with a mouse, and there's no apparent substitute for the mousewheel controls. The tactical combat screen is particularly atrocious, as the '+/-' zoom keys don't even work there. At least let us remap the camera controls and/or anything that relies on a mouse (eg using the arrow keys to control the camera and not units). Even if there isn't an interface for this, at least slap them into and expose the xml file. FWIW, I think this was a problem (no keyboard remapping) in Demigod, but for a turn-based game it really should be possible to play without a mouse, Demigod was more twitchy and it would be less expected. Most of today's laptops may not be able to play it, but if this has sins' legs then it will be more probable.
re: #2 - the UI *really* needs to give the player enough information to figure things out. Right now the game pretty much comes with the cliffs notes version - the game needs to provide the Elemental encyclopedia Yes, we're talking exponentially more documentation here.
re: #3: the campaign lacks polish. It should pull the player in, and probably do a little. more handholding early. For 'the recommended place for newcomers' it does leave a lot to be desired, and it needs to feel more epic. There are some epic elements, but they seem kind of disjointed and they really need to be dialed up to 11. Campaign quests/tasks really need map flags/markers too. eg: Where the heck is the 3rd farm under threat in the swamps (unless this is a bug, and there's only 2?).