The movie version of Bewitched sucked, and The Brady Bunch Movie was only moderately funny (although, truth be told, it was funnier than most episodes of the actual sitcom).
And don't get me started on My Favorite Martian!
It seems I'm often disappointed in the TV shows from my youth (or shows that aired before I was born, which I learned to love from reruns on cable) that are made into feature films. Either the movies are poorly conceived (read: I Spy) or just plain awful. (Didya see S.W.A.T.?)
Here are some TV shows I wish were turned into movies. And an extra wish goes out in the hopes each would be done well:
The Greatest American Hero: Played out semi-serious, this movie has has real potential. The comedic recipe of a flawed hero, romance, mystery, super-powers and nostalgia is a can't miss.
The Green Hornet: Same as above, minus the comedy. Play down the super-hero bit and ramp up the mystery aspect, and this movie works. (Oops, I see The Green Hornet movie is being written and produced by Seth Rogen. There goes my hope it won't be a comedy. Damn...)
Hill Street Blues: It was a remarkable TV show, and could make a wonderful movie. I doubt it would translate to film as well as it did the episodic style of television, but I can hope. I'd be first in line for a ticket.
Baretta: Please! Please, make a Baretta movie. But leave out that damn bird.
Alias Smith And Jones: My favorite TV western ever (followed closely by The Big Valley), this show never took itself too seriosuly and always delivered on the entertainment. I think it works well as a movie.
What's on your list?