I actually like B:TAS Season 4. Mostly for the newer animation style.
It's okay...but it's just not as good as the original three seasons. Watch Mask of the Phantasm and then watch Over The Edge. MoP is smoky, and fluid and dynamic. OTE is angular and straightforward. There's no mystery about it anymore.
The big drawback to Season 4 was that, while the animation is a lot smoother and more in-tone with later Bruce Timm projects like Superman, Justice League, and Justice League Unlimited...the quality storytelling was absent save for a few episodes.
Like
Critters. Best DCAU episode ever.
Unlike the previous seasons where the art is hard to watch (IMO) compared to the newer Timm designs...but the storytelling was better.
The only character who was truly 'fixed' in the fourth season was Batgirl, who was truly hard to watch in the original episodes (with her horrible, gaping, Joker-like mouth). But that's kind of irrelevant, because I hated every appearance she ever made.
Poison Ivy was completely de-sexified in the fourth season (unless you like, short anorexic little girls...don't say anything Ourchair).
But one of the things I didn't like with the transition to the newer art style was that a characteristic portion of Bruce went away. In the earlier seasons we got a clear division of the 2 separate personalities. Bruce Wayne was smiling, always seen around town, and generally a pleasent human being. A stark contrast to his other dark persona. Conroy even made sure to give the 2 characters a different vocal tone.
I think it's
On Leather Wings again, where Batman (in full costume) answers the phone
as Bruce and displays the difference in the two voices. One of the most awesome moments in the show.
But once the new animation kicked in, the difference disappeared. Bruce always seemed cold. And the voice always styed the same. There was no line anymore. Batman was Batman 24/7. And when that happened, a little bit of the show died.
I think that may have had something to do with the fact that they were trying to make Batman/Bruce a little older and a little bit more disillusioned with the world. If you watch the original episodes, the dynamic and banter between Batman & Robin is a lot friendlier and there's a lot more trust. Batman even calls Robin his 'friend' in
Second Chance. In these newer episodes, Batman's a lot more like the 'a-hole' version he was in the mid-nineties to mid-2000s. He doesn't accept anything but the best from everyone and he's a pessimistic, crusty, cynical bastard that isn't cool. Bruce Wayne (while slightly more light-hearted) is much the same.
Luckily, in JLU, Batman returned to his former glory as a dark (but optimistic) hero, rather than a brooding vigilante who's lost all of his drive and hates the world. The comics seem to have brought him back to what he used to be as well (mainly thanks to Grant Morrisson and Paul Dini) although if
All-Star Batman & Robin has anything to say, he could go back to being boring a-hole Batman again. If you ask me, I'd say a lot of Batman's personality in this day and age has to do with how he was perfectly characterised in
Batman Begins.