I think they just expect the new features for the event that the devs have been promising since at least the 2nd Fear Evolved. Actual vampire and werewolf diseases, fixes for the event dinos messing up (like the Zomdodos), new ghosts, etc.
3x rates we get sometimes when they just mess up and want to apologize, so just those rates themselves don't really make this feel like a once a year Event like it's supposed to be. They could have also added in a new boss like they do some years. We only stated with the DodoRex and they added each of the others during subsequent years, so it is pretty reasonable to be disappointed with this event when we only got new skins and chibis but no new bosses or promised features. Especially considering most of us feel like this is the last Fear Evolved they will put any effort in, with Ark 2 on the horizon.