public virtual void UnsubscribeFrom(ReviewTypes reviewType)
 {
     ExcludedReviewTypes.Add(reviewType);
 }
 public Review(ReviewTypes type)
 {
     ReviewType = type;
 }
 public virtual bool IsSubscribedTo(ReviewTypes reviewType)
 {
     if (reviewType == ReviewTypes.Unknown)
         return false;
     return !ExcludedReviewTypes.Any(r => r.Id == reviewType.Id);
 }