The article wasn't kidding when it said major spoilers.
To pull a more spoiler free quote,
Selfishly, as an actor, I read that episode and was like, ‘I can’t believe I’m going to get to play all these things,’ It’s a full-course meal, and they don’t come around all the time
You know those episodes of shows where they flashback and you get to learn a characters entire backstory? That's what this episode is. It's a full course of backstory.
Milioti has been great all season, but this episode really gave her the opportunity to show why she's the other main character.
It's a fantastic show. I went in with low expectations, but it's amazed me.
I will say, the show has no Batman in it. Interviews with the show runner says he isn't going to appear, but maybe it's a lie. Which, is exactly why I had low expectations. However at this point I don't miss Batman one bit.
In many ways it's hardly set in the Batman universe. Don't get me wrong there are plenty of Batman references and it helps if you've seen the 2022 Batman film. But also if you went into the show knowing nothing, it's just the story of a gangster (Oswald/Penguin) on the rise.
The first episode sets the tone and everything, so if you like that, you'll like the rest.