Unless you have friends who want to play with you over more than one session you're bound to find multiplayer less fulfilling than single player action. Graphics, Sound, etc. Perhaps the best part of Imperium Galactica II are the wonderful 3D visuals. Each planet has a unique surface that can also be zoomed and the camera moved up down or rotated around. Some of the vistas are really quite spectacular.
Space battles work the same way.
Aside from the rather odd looking spinning spaceship icons on the main map and some clunkiness in a few of the planetary 3D models the overall effect is quite good. The game does look nice and uses the required 3D graphics card enough that you appreciate the look even if this sort of game really isn't enhanced from a game play perspective by requiring one. Music was generally well done with quiet themes playing while not much is happening and up tempo ditties with greater volume while battles raged in space or on a planet. Sound effects were nothing to really get excited about but the voice acting in the various random campaign elements was very solid. I especially like the voices of some of the crusty alien ship commanders.