I think most complaints are because there isn't underwater gameplay, some things are rabbit hole and you only have open water in Sulani
and then some for not including surfing, group boating, hula, hammocks or hotels or boathouses or whatever previous games had
and some for the gameplay not being as deep as it could be (not having volcano rituals or whatever)
and then some just not liking the pack because they didn't find it fun (in which case idk why ppl get it)
personally like it better than some of the other eps though (gtw looking at you)
and even if i feel it could deal with some additions i still get lot of use out of it so for me it was needed
mostly just miss open water in other places, underwater, hula, group activities and hammocks myself
never fond of the whole ''tourists at beach and rich sims on boathouses'' aesthetics so happy to not have those
and I feel only mistake on mermaids is not being able to go underwater if anything
in short could be better but most part its okay pack for what it is