I'll probably write a short opinion, and not a novel, considering that I'm tired, and had a rough day, and it's late. But, yes.
To be honest, I was very afraid to watch this episode in the first, for many reasons. And I expected it to be much worse than it actually is. Yes, it's not amazing or anything, but it's still enjoyable.
I don't agree with what most of you said about it being noneducational and only for enjoyment. I actually think it dealt with a rather serious issue - what happens when someone who shouldn't be trusted way too much is. And also what happens when you never double question someone's opinion just because you assume he's smart.
I loved how other TLG members weren't fooled by Bunga's sudden "smartness", probably because they are the ones who know him best. And I'm glad Bunga in the end realized on his own what he had done. I'm glad other animals recovered from that brainwashing either.
As for the episode's "main" message about not always having the easiest way to solve problems... yes, I do think that would have functioned better hadn't Kion fixed everything using roar. But I do get why he did it, he used it to save both himself and other pridelanders from grave danger.
As for Mufasa... I don't think he did much of a job here, and his appearance didn't bother me at all. It bothered me more in "Rise of the Makuu", I must admit. I do like to think that Kion has a more special connection with dead kings because of the roar, as that might be explaining many things. It's true that Kion should be facing his troubles on his own, but he's still a cub and he does need at least some guidance. He apparently can't get that from Simba. The king is too busy training Kiara. We'll see. Let's hope they don't overuse it.
Overall, yes, I did enjoy this episode, maybe more than Rise of Makuu. Kill me now.