"Jabberjaw" was a great show, but it was very underappreciated. The show would have been more succesful if it would have appeared before "Scooby-Doo".
The basic plot for the show "Jabberjaw" was the same as in "Scooby-Doo", maybe even better, with a slight Science-Fiction theme and better music than on "Scooby-Doo". But "Scooby-Doo" came first and people saw "Jabberjaw" (and many other shows with simillar plots; too many to remember all of them) as "Scooby-Doo" remakes and the shows were all cancelled.
Today, "Scooby-Doo" has over 200 episodes (and over 5 different shows), while "Jabberjaw" lasted only 16 episodes and "died" after only one season.