The image shows Rosario Dawson so I’m assuming it’s specifically meaning the Ahsoka show, which IMO wasn’t good and though I haven’t seen most of Rebels yet, there were parts of Ahsoka that I disliked which didn’t seem dependent on prior Rebels knowledge. Everything else with Filoni I think of as either great or at least decent.
Mandalorian is like a date that you're excited about and it starts off well, but as the evening progresses you realize there's just not much there.
Boba Fett was shoehorned into Mandalorian with overlapping plot lines, so, I guess to keep the metaphor, Book of Boba is your date's roommate that "randomly" bumps into you at the restaurant and you somehow end up buying them dinner too.