I'll support the call for NCIS, it's a good show and up until recently had the great David McCallum in it, they gave him a great sendoff episode, but it spawned too many spinoffs. Los Angeles, New Orleans, Hawaii and Sydney. And now a prequel in Origins. They've milked it to death. Now at 22 seasons it's growing old with not one original cast member left after "Ducky" died.
For one "national" organisation they seemed to have absolutely nothing in common, in each iteration, especially the IT setup.
The best for me of the spinoffs was Sydney, at least in another country there's was an influence that wasn't American, although I fail to understand quite how Australia would be happy with American law enforcement constantly waving guns around in public.