I don't know about least favorite, but A LOT of Star Wars youtubers have already gone on the attack. The Den of Nerds dude has already said he's not covering Andor anymore, Star Wars Theory is hating on it (not surprising), and other influencers on twitter talking about how Andor is getting low engagement on Youtube and using that as a reason to attack it.
Like, yeah, it's a prequel to a prequel, based on the most interesting character from Rogue One. Did we absolutely need this? No. Am I glad we're getting it and another season is filming soon? Hell yeah.
Cassian Andor is never going to be as popular as Kenobi and Vader, or likely Boba Fett for that matter. But there's no denying that this show is the best Star Wars content we've gotten since Season 2 of The Mandalorian. Kenobi could've been so much better if they sort of built the world out like this. We knew Kenobi lived just like we know Andor will live after this show. However, this show already has me invested in a lot of the side characters and I don't know what their outcome is. Kenobi never managed to make me care about the side characters.