I know the concept of its gameplay was very different from anything we have seen. But if you can get past that, the story behind the game is incredibly entertaining and humorous; not to mention the voice acting holds up really well. Once you overcome the learning curve the game is highly enjoyable. I just think the style is brilliant and its delivery is top notch!
I think if they made the game a lot more accessible and a lot less difficult it could have gotten more mass market appeal and sold well. Most of the reviews are fairly positive. I still haven't beat my copy.