I only watched 1st season of Zomberland. I did have fun with it. Should I watch the 2nd season ?
Im not "really" into Idol anime but I did watch the original Love Live! School Idol Project seasons to see what the hype was all about. I enjoyed it but I doubt I would watch anymore "classic" idol anime.
Season 2 is good, although there aren't really any big shake-ups in the formula. If you liked season 1, and you wouldn't mind some more, then go for it.
I enjoyed S2 more than S1, which seems to be the general consensus. Personally I didn't think either were anything fantastic. The songs are still not good but they have more of them, and the CGI during the performances is a bit better. Imo the best individual moment is still the S1 opening.
Edit: disclaimer, I have 0 interest in idols or idol anime except for Oshi no Ko which I don't think really counts.
If you enjoy this you're one step away from joining me in the hololive/holostars crowd.