Fun and addictive.
The controls are very easy and it only takes a couple of tutorials to learn the interface and keyboard/mouse controls.
Once you get used to it you will be using mainly 5 buttons only:
Mouse right click to order movement, mouse right click (hold) for panning the view, TAB for selecting enemies and numbers from 1 to 3 for assigning and selecting groups (al tho you can create up to 10 groups)