I didn't know that "The Great Divide" wasn't well liked. My only problem was that a century seemed too recent for a feud like the one we saw.
In Season 3's "The Ember Island Players," when Team Avatar goes to see the play, the actors are flying on Appa, and Aang says something like, "Look, everybody, it's the biggest canyon in the world!" Sokka's reply is, "Nah, let's just keep flying!"
Even the writers acknowledged that "The Great Divide" was kind of a crap episode.