Planetary invasion has always been lacking in Galactic Civ. It should not be just a roll of the dice.
I feel that we should have a little more influence on the invasion.
like have a little mini battle we can control so if it looks like you are about to lose the battle you
could redirect your forces to attack structures say they have a natural wonder they built I should have the option to destroy it so it
can be built by me instead. and invasions should not take just one turn a planet is huge.....