I quite like Adam West, even though he doesn't particularly strike me as being very convincing as the athletic, very fit type (a little paunchy rather than muscular in my opinion), but the TV show was a bit too campy for my liking.
Adam looked better in shirtless, pool-side photos of the time than he did in the outfit. I think there was something about that utility belt that made him look fat.
As for the camp element, I think they nailed it in the first season with episodes that worked on two levels; straight adventure for kids and snickering parody for their parents. A lot of those episodes were lifted directly from the comics, and dialog and situations that seemed perfectly acceptable on the four-color page came off as insane when acted out by real human beings. The big appeal of the show for me -- then and now -- was that it was the most faithful adaptation of comic to screen EVER. Everything since has hedged its bets (hence the "armor" for Bale's Batman, biker outfits for the X-Men, etc)
Unfortunately as time wore on the comedy got broader, the budget got smaller and the whole thing became an endless parade of has-been movie stars as "villain of the week" (Rudy Vallee? Liberace?!?!?!) When we saw Batman singing "Buttercup" even the youngest among us knew the shark had been jumped.
If there's any real problem with the "camp" approach it's that it succeeded too well, and so became the only approach Hollywood would take to superheroes for years and years (even seeping into Donner's "Superman" via Hackman's campy Luthor). If "Batman" had been quickly followed by an equally successful but more serious superhero adaptation ("Green Hornet" tried, but failed), then I think we'd have been okay. But people became convinced that campy was the only way to do superheroes...that in fact, comics themselves were camp...and that's where we ran into trouble. Kind of like how after "Star Wars", every SF film had to have "blaster" pistols and comic relief robots. Don't blame "Star Wars" (or "Batman") for succeeding...blame everyone else for having no imagination.