These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Crowning Moment of Awesome: No, not for anything in the show. DC Comics hired Jack Kirby to redesign his characters, leading to an unprecedented deal where he finally got royalties for his characters, as well as publishing the last major Kirby comics work in the "Super Powers" comics.
Crowning Music of Awesome: Say what you want about the series: Badly animated? Maybe. Bad voice acting? Maybe. Plots that were so thin as to be anorexic? Maybe. But the theme song... man, the theme song was epic!
The opening theme of Challenge of the Superfriends ending with the Superfriends and the Legion of Doom running towards each other
Mxyzptlk: What do I have up my sleeve? [Pushes his sleeve back, leaving his glove floating unsupported in midair] Why, nothing, of course! [Evil Laugh]
The evil algae in "Terror on the Titanic", as dumb as the episode was, especially the way that it possessed the scuba divers.
"The Fear" had Scarecrow using his gas to Mind Rape Batman into reliving his parents' deaths. It's both heartbreaking and terrifying.
Seasonal Rot: Inverted in that the various incarnations of this series got artistically better with each one. For instance, for all the snickering about the Wonder Twins, at least they could meaningfully contribute to the fights with their superpowers, which is more than Wendy and Marvin could ever manage. Later, the producers gradually began to realize that the original DC Comics characters were usually better than anything they could create themselves and began to act accordingly such as including Firestorm, Cyborg and Jack Kirby's New Gods villains.
It can't be emphasized enough just how bad that first season was in comparison to all that followed, and not just because of Wendy, Marvin, and the inexplicably anthropomorphic Wonder Dog. The Moral Guardians were at their strictest during that year, so every antagonist the Super Friends encountered was either a Well-Intentioned Extremist that just needed a gentle reprimand, or a Harmless Villain so pathetic that any one of the five adult Super Friends (yes, even this version's Aquaman) should've been able to defeat alone (and yet this would be the only season where every single story was a full-length, hourlong episode!). Starting with the next season, the Super Friends faced villains who 1) were actually evil, and 2) had enough powers and weapons to pose a serious threat it would take the entire team to defeat. Even Gleek was a distinct improvement since, because he was an alien monkey, there was actually a reason why he was anthropomorphic.
So Bad, It's Good: Super cheesy! It really hasn't aged well! And yet you can't stop watching — especially due to the camp!
Tear Jerker: In the "Galactic Guardians" series, there's "The Fear". Egad, "The Fear". It's not the first animated rendition of Batman's backstory for anything. Especially when we see the flashbacks to pre-teen Bruce crying after his parents are killed off-screen, and then his first visit to Martha and Thomas Wayne's graves alongside the faithful Alfred.
"The Death of Superman" is a very powerful episode. The fact that Superman died, the other heroes seriously mourn the loss of their friend, and the entire world deals with the lack of Superman all happened in a Super Friends episode is still quite the shock to first-time watchers.