Take supreme commander, go back in time and copy warcraft 3/starcraft 1 dumb it down for xbox 360 = supcom 2.
Forged alliance fixed a lot of what was wrong with supcom 1 and had the seed and foundation for a great RTS with some good design overhaul, but in supcom 2 they took out EVERYTHING to fit it on the xbox 360, supcom 2 is now about APM (action clicks per pinute) just like starcraft and is now a traditional RTS clickfest. New players that never played the first two games may like it, but I advise newplayers GET FORGED ALLIANCE before your thumbs down my review, come back to this review in two months after you've played both games and see how you feel.
In supcom 2 the single player is a throw away, the characters and story is actually WORSE then the first game, so if you were expecting a better story - sorry to disappoint you, they did a really bad job with the single player campaign it is even more awful then the first game by miles.
Experimentals are weak an the sound is bad, there are no cool "screen shakes" an powerful sound effects that were in the first game that made you feel like your experimentals were these giant heavy hunks of power, in Supcom 2 experimentals are Slightly suped up regular units that die easy to masses of lower tier units, they are not "army killers" like they were in the first game.
The multiplayer is probably the only thing that this game is good for, but it will get OLD fast. The single player skirmish which I loved in the first two games is broken because the AI sucks and there is no more base building because they took all the base buildings out almost! That and the AI is bad compared to the AI modifications in Forged alliance expansion of Supcom1 which you can find here - http://forums.gaspowered.com/
I'm going to explain why supcom 2 failed as a game, it will be fun for about a month before everyone moves on but it's not the epic game we were all hoping for in supcom 2, supcom 1 had problems no doubt about that,
The main concerns were
-Economy felt too complex (the only problem was income and unit costs were not presented in an intelligent way numerically/graphically so anyone could understand it at a glance, the ECONOMY itself was fine, just presentation confused new players)
-Long build times for buildings and units
-Units not that diverse BUT lots of units
They only needed to overhaul the build times and make the factions more diverse with some slight economy tweaks, but as it stand snow? They took out all the defensive buildings from supcom 1, and lots of things were made worse.
-Less land units
-Less Sea units
-Less turrets and defensive structures
+More experimentals
-Experimentals are no longer "epic" army killing machines, just regular units
Research tree is BAD it is too simple and upgrades are ho-hum and mediocre, you'll blow through the tech tree in less then 10-15 minutes of the game, and the tech tree is so bland that you will be bored within a week.
The user interface in supcom 1 and forged alliance just needed tweaking and a simpler presentation of whether your economy needed to expand or not, with some research upgrades for land units so that lower tiers didn't become completely obsolete like in Supcom 1 and forged alliance.
The next thing it needed was build time overhauls of buildings like pgens and mass extractors, and experimentals, with cost modifications to speed up the game a bit. But they DID NOT DO THIS in supcom 2, they basically took everything out put in less units, updated the graphics, it will be fun for about a week and then you will wish they had upgraded forged alliance.
Get forged alliance and wait for supcom 3 or Starcraft 2!