OMG OMFG OMG OMFG OMFG OMG OMFG !!!!11!!eleven and other such interweberry... (Yes, I think it's pretty good)
It's pretty, but more importantly, it's a lot of fun. There's nothing like building your force and swooping down on the enemy and watching the carnage ensue. All of the units solid enough AI to try and use their strengths and hide their weakness. The campaign mode as a decent enough story, and it's played out by reasonable good voice actors. The videos are pretty, and it seems they at least tried to give you something to think about while you're clicking around between cut scenes. Really, my only complaint is that some of the missions can be long, lasting for hours and hours, as the map is continually opened up, and, especially if you missed the dialogue, you can easily not understand WHAT you're supposed to do for a specific objective. (A good example is the second mission of the UEF, an objective opens up where you need to get to a base to help them evacuate, the dialogue says what not to forget to bring, but, the object just lists them as: 0/12 0/20 0/8... 0 of 12 WHAT is not made clear if you missed it...)
The skirmish modes have tons of options so that you can customize the game to your tastes, and, with various mods, you can extend the replay value indefinitely... which is good since there isn't a system built yet with the power to run this with settings maxed, you'll likely play for quite a while, and then, when you get that new 9950GTXST2SLI4 card, you'll be reinstalling just to see how many particles you can get. And I'd be willing to bet that you'll get hooked again. Back on track though, the skirmish mode has more than enough to keep the game re-playable, even if you don't have that 1337 cable connection, especially with the ability to alter the games AI so much and taylor the game to the playing style you most like... or are challenged most by, it doesn't get boring easily.
The multiplayer is really where it's at, even if I suck to the point of hilarity compared to most people out there. As I said, I'm pretty green with the modern RTS. However, the fact that you can have 3 hour sieges, or quick 45 minute romps is great. They have a built in matchmaking system, clan, ladder, and ranking systems as well, and all of it is free through their service. Of course, that means you'll need to get it out of your system now, before it's down to that select 100 players and they either cancel the service, you find you'll never beat any of them. (Sorry... I just know how proprietary game servers tend to be, once the game's no longer the flavor of the week, the multiplayer goes all to hell...)
Overall, this game is just fun as hell, and I can't get enough of it, and by the looks of things, a lot of people feel the same way. It's one of the few games I consider well worth investing in new (at full price, I mean), and like I said, I don't even like RTS's.