I love to play F5, however I end up always in a group where the other players do not play much or don't even play. It is very disheartening. I find it great to get a small reward every time I play.
Yes, I loved it, however the one that you lose and go back to the beginning should at least give you up to 3chances, because it becomes very boring having to go back when you are in level 5 for example.