I like the ones that have no superheroics and are quite mundane/realistic and low-key in nature. Not that I don't like the fantastical ones too, but I like the one with the 2 brothers and one's a priest and the other's a crook, or the one with the crime doctor.
You could kind of cull together a subset of the episodes that is all small gritty crime stories like that. I with there had been more of them.
Another one, with a very low-key, mature, personal story, allthough somewhat science-fictional, is the one with the invisible-suit man who wants to kidnap his daughter. Really great stuff.
I wish the'd do a series even more mature and adult than BTAS with a lot of stuff like the above. Oh well, maybe after "The Batman" is done.