WHAT WAS GOOD?
The story quite cleverly retconned the new Thundercats into the already established mythology and did so by returning to an event that took place within the opening episode of the series - the destruction of Thundera!
By doing this the new characters slotted into the story quite easily and it made for a more interesting tale. Admittedly the inclusion of so many characters in Thundercats - Ho was purely so that more toys could be sold (this was the '80s after all), but who cares as it all made for an epic adventure! Oh and this particular Thundercats story took place prior to the introduction of shit villains the Lunataks who were...
...well, they were just shit.