Everyone has their favorite Batman, Whether it is the more recent Christian Bale, the classic Michael Keaton, or the only right answer in my opinion: Adam West. His Batman was the most fun by far, and while it was extraordinarily campy and goofy, it was aware of that and made the most of it.
You might try to argue that the dark and gritty Batman is a lot more entertaining to watch, but you know what, there is so much more to Batman than his awesome fighting skills and gravelly voice.
Adam West's campy Batman show is obviously one of the reasons why we will miss him, but at least we have the show to look back on forever. If you want to rewatch the original series you can buy it all on Bluray now!