Esta es el método para la generación de reputación de cada usuario, me pregunto si está bien, quise que tenga en cuenta la inactividad el usuario entre otras muchas cosas.

public static double GetReputation(this IUser user)
{
    var voteCommentService = ServiceLocator.Current.GetInstance<IVoteService<Comment>>();
    var commentvotes = voteCommentService
                            .GetVotesByUser(user)
                                .Where(w => ((Comment)w.VoteFor).ForStory.IsLockedOut != true);

    var storyService = ServiceLocator.Current.GetInstance<IStoryService>();
    var commentService = ServiceLocator.Current.GetInstance<ICommentService>();

    int userCommentsCount = commentService.GetByUser(user).Count;
    int userStoriesCount = storyService.GetByUser(user).Count;

    int votesNegative = (int)commentvotes.Where(x => x.Rate == -1).Count();
    int votePositive = (int)commentvotes.Where(x => x.Rate == 1).Count();

    TimeSpan tsSinceFromRegistered = DateTime.Now.Subtract(user.RegisteredAt);
    int daysSinceFromRegistered = tsSinceFromRegistered.Days;
    if (daysSinceFromRegistered == 0) daysSinceFromRegistered = 1;

    TimeSpan tsInactive = DateTime.Now.Subtract(user.LastActivityAt);
    int daysInactive = tsInactive.Days;
    if (daysInactive == 0) daysInactive = 1;

    double netScore = (double) daysSinceFromRegistered / (daysInactive * 2);

    double reputation = (double)((votePositive * netScore) - votesNegative) + userCommentsCount + userStoriesCount;

    return reputation;
}