Here's some even crummier movies based on tv shows:
The Avengers (Steed & Emma that is, not the upcoming Marvel super-heroes characters) The Beverly Hillbillies The Brady Bunch Movie & A Very Brady Sequel The Fugitive (actually it's not too bad) Scooby Doo and sequel
"Land of the Lost" came out last week, and by all accounts was a successful movie.
"The Incredible Hulk" movies were not based on the tv show--they were based on the comic book which is 15 years older than the tv show.
As someone said, "successful" could have different meanings. But both House of Dark Shadows and Night of Dark Shadows (based on the ABC soap opera Dark Shadows) were successful in the sense that they were profitable for MGM.