All of that is based on nothing but the first episode. Everyone knows now that it doesn't make the best first impression about the series as a whole, but people didn't even want to give it a chance.
See >>93709149>Nothing we've seen has hinted at even the ability for a plot. It will be pure monster of the week.>With Steven Universe you could see from the beginning how you might have questions about the gems or Steven's mom and stuff like that, in this show there is no such thing.
It would be unreasonable to assume right from the start that the show would have gone from "Star and Marco eating nachos on the couch" to "TO BLACKEST NIGHT I PLEDGE MY SOUL AND CRUSH MY HEART" but the potential was always there.
People don't have faith that character or setting development can emerge from things that they don't immediately like, which is asinine but I can hardly blame them with how garbage most /co/ media is.