I think it's way worse than FGO. It's also awful.
There are event stories, those are mostly fun.
And there is the 1 main story, the biggest problem with it, is that it's slow, very slow. It's been a year and you could say we barely just finished the build-up. I think it will conclude in 2 years.
It's also hard to take seriously as it's over the top, with over the top villains.
The way the writers use the original characters is downright pathetic, nips theorize that many dropped the game because of this reason.
They drag the story down a lot, and the alternate story that focuses on them is one of the most boring things you'll ever read in your entire life.
The best part of the story is that some ideas are neat.