Hey! How dare you insult FernGully! The idea of a lumberjack becoming a faery by accident, becoming one with their people and realizing what the humans are doing is wrong, then he destroys the big machine but it takes out a lot of their land first.. In the end everything works out.
Wait... you weren't talking about http://www.imdb.com/title/tt0104254/ The cute and still fun to watch animated film from the 90's were you? Yeah, you were talking about Avatar. That movie that blew me away visually in theatre but when I watched it at home I literally couldn't finish it.
All sarcasm aside I payed $20 to see Avatar in theatre and did not regret a cent. From a visual stand point it's pretty fantastic. But if you don't have a theatre in your home... Well, it is terrible.