A lot of mmo players don't consider solo content to be new content in an mmo. Solo content doesn't carry much attraction for an mmo player, it is used as a means of leveling to get to group content. the repeatability of solo content is nil. I can't even get myself to finish it once because i am already leveled up.
Their mistake was to focus on solo content, that is why most people are unhappy. If you think about it group content is repeatable ad naseum. much of the group content is still being played after five years, although many have left due to lack of new group content. I dread the fact that many of my alts still have to be dragged through kotfe just to get rid of those alliance crates. I just can't bring myself to keep doing it.