Maybe the better way to describe it is that every other episode added an additional shark for the Fonz to jump.
For me they jumped one shark too many when the Dragon died and came back.
That was the last episode I watched, and I called it the whole way it was so predictable.
It's not about dark and brutal, its about just knowing when to say when... and they didn't.
*shrugs
That was the straw that broke my back... but there are lists of other Shark jumping moments.