I have fond memories of this series when I was a child. It also prompted me to read the original series of books by Edgar Rice Burroughs. In some ways, the character is faithful to the books. But there's no explanation of why he's still in the jungle. In the books, Tarzan stopped living alone when he met white people for the first time, had his first romance, and learned English, went to England to become educated. This Tarzan already speaks English, but has no regular contact with civilization, and seems strangely uninterested in women.
And while the stories individually were well written with impressive dialog, they don't make a lot of sense in the aggregate. For one thing - this jungle has Vikings, Romans, Aliens, colonial hunters, mad scientists, etc, but no native black Africans?? Maybe the producers were worried that would offend black viewers?
The other thing that doesn't make sense - how many dozens of lost cities and civilizations can there be, all within a short walking distance of Tarzan's jungle? And, this guy who is supposedly lord of the jungle didn't know about any of them, even though some of them had been there for hundreds or even thousands of years?
Animation looks a little dated and a lot of it is recycled. Still, it was a heck of a show for it's time. Ambitious, imaginative, and full of wonder. Enjoy and just don't take it too seriously!