I'm not a huge fan of graphic novels. For me, they seem to take the imagination out of reading. However, I am a huge fan of Mass Effect so felt I had to buy this to keep up-to-date with the story.
The story itself fleshes out a lot of the back story of both the Illusive Man and Saren, explaining how their personalities and philosophies were shaped during the events of the First Contact War. You also get your first views of Arcturus Station and Palaven (the Turian homeworld).
I'm not even going to try and review the art because, as I said, I'm no expert. All I will say is the drawings are clear enough to figure out what's going on.
In summary, I'd recommend buying this if, like me, you want to be aware of all aspects of the Mass Effect back story. It will help explain the motivations of 2 of the key characters throughout the game.