The worst national television series that come to mind:

This began as a comment on Bill Crider's blog, wherein low-budget Houston commercial station Channel 55 is hoping to run a block of Really Bad programming to draw fans of such. Such worthy contenders as MANIMAL and TJ HOOKER and HOMEBOYS FROM OUTER SPACE were mentioned by commenters on both Bill's post and the HOUSTON CHRONICLE posting of the story.

But these all came to me quickly...

THE REAL WORLD OF TAMMY FAYE (THE VIEW may not look less inane in comparison, but certainly less insane.)
THE RICHARD BEY SHOW (though only JENNY JONES among the tabloid talk shows actually got anyone killed, I think)
THE RAT PATROL (sorry, James and Bill...but this has been my high-water mark for mindless he-man drama since seeing it as an adolescent, and in this case, that's a bad thing.)
STRANGE PARADISE (the soap-opera Jamaican? zombies DARK SHADOWS ripoff)
ON THE AIR (the complete misfire historical comedy-drama project of Lynch and Snow after TWIN PEAKS--though the similar REMEMBER WENN was nearly as dire)
IN SEARCH OF, narrated by L. Nimoy
THREE'S COMPANY/THREE'S A CROWD
WHAT'S HAPPENING/WH NOW
THE 700 CLUB (lies, damned lies, and begging for money to deliver more)
WHAT'S IT ALL ABOUT, WORLD?, a rightwing answer to THE SMOTHERS BROTHERS SHOW and LAUGH-IN
ALIAS, perhaps the most overrated terrible show thus far
SCAREDY CAT, just the worst Saturday Morning cartoon I've ever seen, though LAND OF THE LOST might just be the worst of the "live-action" Saturday morning dramas...or at least feature the worst acting I've seen just about anywhere.
THE CHAIR and THE CHAMBER, game shows involving actual torture

My father would want me to add MOTHERS IN LAW...I haven't had the pleasure of that one, nor DR. SIMON LOCKE, YOU'RE IN THE PICTURE, MY MOTHER THE CAR, or any one of a number of truly atrocious-sounding programs.