I recently completed the single player mode of Supreme Commander 2, and here are some brief notes on it.

Good

• Good in-game visuals. Top notch in-game animations in particular unit explosions.
• Improved micro-management. Appreciated the removal of engineer and factory tiers from the first Supreme Commander, as well as being able to repeat build orders on factories allows one to focus on the fun part; commanding armies.
• Game ran smoothly on my dated computer. I played the game on my fairly old laptop on the Medium graphics setting and it ran smoothly as well as looked good.

Bad

• Pre-rendered cut scenes didn’t look good. To be fair though the game was released half a decade ago.
• Single player mode was short. Supreme Commander one feature three seperate campaigns Supreme Commander 2 felt like it hacked together three half campaigns.
• A weak story. The primary flaws with story are its underdeveloped characters, and a loosely strung together plot. It tries to have its ‘moments’ but unfortunately they fall flat given the lack of story depth.

Both

• Smaller scale. Though the maps are smaller in scale, in some ways this is a benefit as you don’t have units travelling for ages to get to a battle, thus there is less time between ‘action’. Yet the point still stands that the overall scale of the battles have been shrunk, and with it the feeling of being the Supreme Commander.

Conclusion

Overall I enjoyed the experience. Supreme Commander 2 definitely has some improvements from the first game, though I get this feeling that the game is less that perhaps it intended to be. Perhaps due to time/budget constraints?

Nevertheless if  you enjoyed the first Supreme Commander the second is certainly worth checking out.