Nice! I just played through the campaign about 2-3 weeks ago during my retro summer run. I've actually never beaten the hard campaign, but I really enjoy the normal campaign...other than the first few stages which are essentially tutorials. The AI was slightly improved and many AI-exploits that I used in the first game no longer worked. I agree, however, that AW:DS got really crazy with the attitude of "hey let's add a million playable CO's some of whom are OP and let them both have a turn during super CO power" which I feel made the game unbalanced.
Dear Intelligent Systems: With a franchise like THIS, permanent death makes sense and is fun. One could lose dozens of units and not feel the need to replay the stage. Please make more games from this franchise.