Watched the first episode of The Book of Boba Fett and I honestly didn't care for it.
I'm probably in the minority that never cared about Fett. Yeah, his armor makes him looks like a badass, but he was a total jobber chump in the movies. And I didn't care about him appearing in The Mandalorian, either.
And this first episode was just dull, honestly. I can't recall, but did they ever explain why Fett wanted to go back to Jabba's palace and take over? I'm pretty sure it wasn't in Mandalorian and it's sure as hell not explained here. So there's no reason for me to care why he's doing any of this. The constant flashbacks to fill in the gap after his fate in Return in the Jedi were slow and didn't make me feel any more invested.
I think part of the problem with this show is there's no interesting hook. It's just Fett doing stuff, and with little explanation on his motivations.
The Mandalorian, on the other hand, started with an immediate motivation: hired to retrieve a McGuffin. And then that McGuffin is revealed to be...Baby Yoda, later named Grogu. And not only was "Baby Yoda" an instant new merchandise machine, but it was an interesting hook with unlimited potential. Especially since we know nothing of Yoda's species. Plus, it created a unique set up in this badass bounty hunter carrying around this tiny creature (admittedly, the set up is similar to Lone Wolf & Cub, but it works). It was an instantly iconic duo.
And none of that is in Boba Fett. It almost feels like they're trying to coast off the brand of Fett himself, figuring Star Wars geeks will tune in anyway because it's Boba Fett.