I enjoyed it, but I agree it wasn't as good as it could have been. It would've been great to do a full story more akin to a movie (or at least 30-minute episodes) rather than the short stories.
Have I Got A Story For You: Enjoyable, except for the weak ending (I prefer Batman to be more badass). Similar (story-wise) to a Batman: TAS episode, but good nonetheless.
Crossfire: Build-up was too slow for me, but the payoff was excellent. The last scene was very well done.
Field Test: I liked this one, except for the choice of design for Bruce/Batman. He was too young, so the voice really didn't fit well (I love Conroy as Batman, but the look has to fit the voice).
In Darkness Dwells: Okay, nothing special. Fight with Croc was pretty mundane.
Working Through Pain: A little slow, but good otherwise.
Deadshot: Best overall. The set-up was well paced and the fight was also well done (not as good as in Crossfire, but the rest makes up for it).
Note that I've watched all Batman: TAS, Superman: TAS, and Justice League episodes, and I really enjoyed the World's Finest story arc's portrayal of Bruce/Batman.