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.
I have no complaints about it's functionality. I do think it is too minimalistic, however. I prefer my UIs to be expressive, as long as it does not get cluttered.