As someone who faithfully watched it on its first run back in the 80s, I'm here to tell you that outside the opening credits:
THUNDERCATS REALLY WASN'T VERY GOOD
Honestly, like most other shows of its day, it was a long-form toy commercial, selling action figures and vehicles, with a simplified plot for kids to re-enact with those toys. Granted, Transformers, G.I. Joe and Masters of the Universe were even more blatant commercials, but in the end that's what all of them were. Including T-cats.
@gcupc The whole worship of Masters of the Universe puzzles me even more. It seems to survive entirely on nostalgia, given the animation was Flintstones-level but without the good writing.
@Nezchan @gcupc Most of these shows, the title sequence/theme song is really the only good part.