This is the Batman series I'm least familiar with, other than the one currently airing, so I decided to give it a go. I've heard it picks up in the third season, but that remains to be seen for me. For now, I enjoyed the first season, but it had its issues and I can definitely see why some fans were turned off.
Most things about Batman himself they got spot on. The costume, the attitude, the gadgets, Alfred, all worked, at least for me. The only problems I had were when Batman took off the cowl. For whatever reason, the show decided to emphasize the "playboy" part of the Bruce Wayne persona (at Alfred's insistence, even), and it clashes with the rest of the show. It's kind of jarring to see Bruce Wayne hitting on some ladies at a basketball game or relaxing at a coffee shop, and then immediately cutting to the more grim and serious Batman when he gets a call. When Bruce is doing other things, it fits better, but that sadly isn't too often. Also, Bruce Wayne's face is drawn weirdly when viewed from the front.
But the villains are the important parts of this season, why each episode varies, so I'll go over each:
Joker: I... actually like this Joker a lot, and I'm usually not a fan of the Joker. He strikes an excellent balance between menacing and silly, something I never got from a number of other Jokers.
Bane: Okay, but not memorable at all
Mr. Freeze: Very disappointing. None of the classic backstory, just a generic psycho with freeze powers
Penguin: Possibly the worst Penguin. Instead of making him a classy bird, they tried to make him as obnoxious as possible. I do like the way he's drawn at least
Manbat: His motivation was quite shallow, but he was appropriately scary
Catwoman: I'm okay with her, but I wish they would've turned down the flirting. Also, her costume's ears are ridiculous
Firefly: I've never heard of this villain and they made zero effort to explain where he came from. Otherwise, he's alright
Scarface: I forgot about him and had to edit him into this later. That should tell you something.
Cluemaster: Why does this cheap Riddler knockoff deserve to be a Batman villain?
Clayface: Definitely saved the best for last, I loved what they did with him, though I miss his old design
So yeah, definitely more misses than hits for me. But I think it has potential, and I'll keep watching.