I will tell you this: back in the day in S1, the show was having difficulty finding its bearings. Not many people knew about it either. What we used to say to newcomers back then was that, watch Mewberty and the Blood Moon Ball episodes (or rather watch the show until that point, I think... episode 8?) and if it doesn't do anything for you, then the show is not for you.
Star is still cute with Marco onscreen and in general. I'll give you a list of a handpicked episodes mainly centered around them.>Blood Moon Ball>Mewberty>Cheer Up, Star>Storm the Castle>Gift of the Card>Camping Trip>Diaz Family Vacation>Starsitting>Game of Flags>Baby>Scent of a Hoodie>Lint Catcher>Booth Buddies>Ransomgram>The Knight Shift