Video quality varies by upload (some are DVD-rips, others VHS-sourced), but given the age of the show and the rarity of official releases, the Archive’s versions are often the best you’ll find anywhere.
Here’s a positive review for The Legend of Tarzan (available on the Internet Archive):
I recently came across The Legend of Tarzan on the Internet Archive, and what a fantastic find! Whether you're nostalgic for the 1990s animated series or discovering it for the first time, this archive upload is a treasure trove.