It was better than I expected. The dialogue was a bit purple at times, and I didn't care about the teenager/school stuff, but the characters are moderately interesting. I'd wondered why they created a new lead character to be Bruce's adopted son, but I guess it's because they needed one who wasn't a Robin, and who wasn't in on the secret.
The mix of characters is somewhat interesting. Duela is a particular highlight so far. I've only seen Harper and Cullen Row before in the animated Young Justice, but their backstory seems pretty consistent, although YJ didn't mention Cullen being trans.
The biggest credibility issue for me was that anyone would seriously consider the idea that three teenage petty crooks could've taken down the goldang Batman. I mean, even as Bruce, he would've taken them out in seconds. The fact that the cops were in on the conspiracy ameliorates that somewhat, but it's still weird that nobody brought up what a deeply implausible frame it was.
I could do without the Court of Owls angle. I'm so, so sick of stories about huge, ancient, all-powerful conspiracies.
EDIT: Also, why are Berlanti productions so obsessed with having Batman kill the Joker? It happened in the Arrowverse (twice, counting Kevin Conroy's dark alternate Batman), it happened in Titans, and it happened in this universe. At least in the other two continuities, Batman snapping and crossing that line marked the moment he gave up being Batman and left Gotham. But that's not the case here.