This is definitely a good episode. Just imagine, the Swat Kats on the wrong side of the law and to top it all off allies with the Dark Kat.
Sure, the "alternate reality where the good guys are bad" story line has been (over)used for some years now, but this episode has something that makes it special. I just loved watching the Dark Swat Kats argue all the time (as opposed to the regular Swat Kats who work as a team), and the great fight scenes between the characters. One thing I would have liked to see was the Dark Kat turning good (after all, this was an alternate reality). It would have been a nice twist. But the episode was good enough even without that.