In the same way they deliciously lamponed Sealab 2020, Harvey Birdman is a twist of an old HB cartoon. The humor is actually on several levels - there is some sexual inuendo and bathroom humor, but there are many pop cultural references and legal satire as well.
The episodes are uneven - some are excellent, some are a little strained. Knowing some of the original characters helps the humor - certainly, Mentok, acting as a judge is WONDERFUL!!!!
So, if you can accept some of your childhood memories being skewed, and enjoy some well aimed satire of the legal system then get this!