I mean, I tried playing it for a while, but it felt like they took out all the things that made one want to spend money and fight for events out of LLSIF, just for the sake of changing things up. Failing songs when your team wasn't that strong (I literally failed some of the harder songs while perfecting it. You just fail, no half successes, or reduced points. Just outright failure). Really got capped at stamina really early on. Just wasn't very fun to play when you got just a little bit serious.
Yeah, I feel the same way. It was much more grindy and required more upfront money to actually start up - like you said, you could fail Expert songs even if you full combo-ed them.
I imagine things changed after several updates, but let's be real - I assume the appeal of Love Live and Idolmaster and all the other anime rhythm games is the waifu collecting. And while the cast of Glee is large enough to have a huge number of cards, I don't think anyone really cared about Glee a year after the show ended.
But for me it's just a reminder that Klab could just shut down the game and you would have nothing to show for it. I assume people have ripped the files on Android so they could piece together an offline version with all the cards/stories unlocked, which would be an okay way to preserve it. But like any "games as service" thing, it seems inevitable that you'll lose access to everything. It's just crazy to read stories from people who spent hundreds/thousands on Glee and them feeling burned by it to the point of wondering if they could get refunds from chargebacks or whatever.
(I still think it's weird that the PSP Idolmaster games that were on iOS can just be wiped from history and never redownloaded again, so even offline digital games aren't safe these days).