Immense but can be overwhelming.
Gameplay: Though the game has 3 factions, the stories behind them seems rather bland and perhaps even inconsequential. Perhaps the biggest drawback to Chris's Total Annihilation as well. However the immense scale and grandoise of the game just simply makes you go: WOW. The strategies behind the game is simply top notch and it really gives RTS players a much different approach. Though we are still plagued by "tier based" upgrades, I've found that proper use of troops, micromanagement, and control of terrain, rather than only resource collection and economy is key to winning the game. It is refreshing and definitely well worth the time on investing on making better strategies and knowing the weaknesses of each unit type ==> No more tank rushes, you will need to use combinations of units to win.
Graphics: I think the graphics does a great job of showing the scale between the small tier 1 and the immensity of the prototype units and that is definitely a great introduction to RTS. However when compared to say Company of Heroes, I think Supreme Commander falls just a tad short.
Sound:
Pretty good job on sound and excellent job on music.
- Well worth playing online, but games can take quite a long time, so definitely not for the casual gamer.