It is not true that everything was cheesy in the 70's. There were plenty comics, movies and even cartoons that were darker or dealed with more serious stuff.
Aquaman was depicted as useless by cartoon-makers who did not know what to do with him.
Same thing happened to Simon Belmont in the Captain N cartoon, and Jean Grey in the 90's X-men cartoon.
I would also add "and Superman in the DCAU Justice League", but it has been a while since I watched it so I am not sure of if my recollections of him being frequently used as a punching bag or a prop to make Bruce Timmy's favorite character look better are accurate.