A good game, despite it's flaws
Gameplay: Its awesome. Simply great. Its about as friendly as WoW or EQ, so don't underestimate it. It has a ton of choices and so much to do within the game that you'll not be dropping it because you were bored.
Graphics: Well, it's kind of obvious it's really not all that great, but hey, it's free right? The scale is turely awesome and you get a great immersion within the game as you can explore vast lands. The only bad thing, the textures look blocky.
Sound: Sound is very good, I found nothing wrong with it. They have some good music as you run around blasting heads off aliens and mutants, the sound effects are fine too, youll keep your sound on for what it's worth.
Story: Eh, what can you say? It's like WoW, it has no story, just go arround and have fun. :)
OVerall it is a good game since it is now free, and you'll probably find a lot more fun if you get an expansion. At least try it out, but have some patience as the download is an SOB, and that is an understatenment (like 8-15 hours, I'm serious) But for what it has to offer, you may enjoy it.