Critical Hit! says: "It’s said you should never judge a book by its cover. But the simple fact is that we all do it. We can’t help ourselves.
The job of a cover designer is to create an image that makes you want to read that book—or in our case, play that game. A successful cover has two goals to accomplish: it needs to get your attention, and it needs to visually summarize what makes this game so great that you should play it. Unfortunately, the covers of Mass Effect do neither of these."