The 70's had its share of subpar animation, to be sure. For every "Fat Albert" there was a half-dozen "Partridge Family 2200 A.D."'s Although Filmation did release the much-overlooked "Young Sentinels"- hopefully that will see daylight again someday.
Scooby was best in its original incarnation (besides boasting a contender for "Best Saturday Theme Song Ever") before the copycats moved in. But if you were around circa 1976, pre-cable, and you only had three (count'em. THREE!) channels to choose from, you couldn't be too picky. At least there was always the old Pink Panther or Looney Tunes shorts to fall back on. (Even Rocky and Bullwinkle too).
PBS was a godsend back then, especially in the summertime, when they would have a block from 7 am to 9 pm of Sesame, EC, Mr Rogers, Zoom, etc. Almost a prototype of what Noggin or Sprout could've been if we lived in a perfect world.
But if you ever got dissatisfied/bored/disenchanted with your viewing selections, you could (drum roll, please) turn off the tv, get your face out of the screen, and get a breath of fresh air. This option still exists today, and is worth exercising once in a while. Don't knock it til you try it.