I liked the finale, and it basically put the characters where they needed to be, but I still don't buy Bruce's decision to become Batman. We got so little of him, he already made the choice to become Batman without having seen the condition Gotham is in. If we had more, I would've loved to see scenes with Bruce and Alfred (and Lucius, who seems to be in on it). So no Wayne Manor, no Batcave, no name drop (only Penguin even so much as acknowledged the costume looks like a bat) but at least the last shot was of a costumed Batman.
I'd be disappointed in that we got a definitive origin story for Mr. J if he didn't look so great. Echo, on the other hand, was pointless. She never got to hench for Ed, and she wasn't much of a Harley Quinn.
I liked that the new Selina actress had the same hairstyle, but I feel like her speech to Bruce in the shadows should've gone to Camren. Technically, we didn't even really see what Bruce plus ten years actually looks like either.