I thought it was ok. I felt like it dragged on a little bit, like for example some of the levels/cutscenes just felt like filler at times. But the ending was good, I'm glad they brought it to a nice conclusion and I liked the final level. I also liked the voice acting.
Some times a level could be frustrating though. Like the difference between winning and losing was whether a unit would get past the armour and finish off a tank before it could kill me just to have the unit miss altogether... Or I would have units covering each other in a massive defence but the AI would run away and make attacking the object impossible. Not all the time though, just when I had to attack. When the ai was on the offensive it worked out better for me.