they had a good idea in that X series of games.... X2 the threat and x3 reunion.
Its a pretty complex UI in X2 already, but once you are used to it, your good. Then they made drastic changes to the UI in X3...... however, they added a simple option to revert back to traditional UI of X2 if you wanted too.
I ended up learning the new X3 UI and preferring it ..... however, given the same UI option between Galciv2 and galciv3, being allowed to use galciv2 UI in galciv3.... i would have to say, i would definitely stick with the galciv2 UI
Would you?
Edit: 2 things i would love from Galciv2 UI.....
1) ability to see i already have a constructor heading to that starbase (priceless)
2) Ability to end turn any time..... very priceless!