Well, I would give Terria 4 stars(it's relaxing and nice, but hardly a masterpiece IMO0, so I voted the first option. If somebody gave it one star, then he's either a) a troll interested in lowering the album's average ranking or b) a person who listened to Terria and did not like it.
Knowing that every person is allowed to not like whatever he wants or even to dislike everything his ears come around, we should respect that and we may not suspect him of being a troll, since we have no idea what people have on their mind when they make decision. This is... internet! So, that's basically it.
If you mean, that one star rating to great albums is unfair, then I am going to tell you that the whole system of counting votes without reviews is unfair, but what can ya do?