Do people complain about Solasta's UI? Why? I think it looks smooth and swish... it's clearly your user interface - it doesn't need to look like some piece of fantasy world setting. I found it to be unobtrusive and inoffensive... functionally, the UI itself never drew my attention, and that's exactly what a good UI SHOULD do.
Asthetic is pretty poor and uninspired, but it is layout and practical design I am more interested in right now. I wouldn't say that visual flurish isn't important, but UI's role is mainy functional - players interface with the game. And as function go, Solasta's UI does seem to be designed pretty well.