Gotham Knights.
It's not terrible, but it's pretty much what I was expecting.
Could really do without the crafting shit and leveling system. I know the Arkham games also had skill trees and what have you, but it wasn't ever as bad as this.
I do think I fucked myself over a bit in not focusing on the main story early on, because I very nearly burned myself out on the side activities.
Turns out that a lot of my issues are kind of addressed at key points in the main story as well, so I really should focus on it more (like getting the glider thingy from Lucius, which I had no idea existed and would have been a tremendous help earlier on when I was navigating the unnecessarily large - and, to be honest, very boring - open world).