After watching the three Flash shorts, the question I asked myself was, "Would I really like to see more of them?" I guess the answer would actually be yes. While I feel like three episodes were more than enough to showcase the Atom, I think the Flash had a lot more potential to be tapped. That's not to say the Flash shorts were great, but it seems like the character could have provided Filmation with his own series. In any case, the Blue Bolt character made To Catch a Blue Bolt the episode of the three I would recommend, just skip the last 30 seconds with the cat.
Essential Episode:
To Catch a Blue Bolt
Essential Episode:
To Catch a Blue Bolt