Actually, having another think about this, I think it would be a good idea to introduce a percentage. That would allow us to solve this problem and also give users a consistent basis for which to compare the usefulness of reviews.
e.g.
"6 out of 8 people (75%) found this review useful"
"1 person (100%) found this review useful"
"1 out of 8 people (13%) found this review useful"
alternatively, without the percentage:
"6 people found this review useful (8 votes)"
"1 person found this review useful (1 vote)"
"1 person found this review useful (8 votes)"
Actually, having another think about this, I think it would be a good idea to introduce a percentage. That would allow us to solve this problem and also give users a consistent basis for which to compare the usefulness of reviews.
e.g.
"6 out of 8 people (75%) found this review useful"
"1 person (100%) found this review useful"
"1 out of 8 people (13%) found this review useful"
alternatively, without the percentage:
"6 people found this review useful (8 votes)"
"1 person found this review useful (1 vote)"
"1 person found this review useful (8 votes)"