This is one of the most entertaining movies I've seen. It's Dances with Wolves, Pocahontas, and Fern Gully mixed together. I don't think reverting back to the stone age is better than developed civilization, but Avatar makes important connections about greed, love, and our need for connection with nature and deity. Despite evil warmongering soldiers, heartless corporate executives, or Cameron's obvious and annoying lines referring to the war in Iraq, this movie is impossible to forget.
Sam Worthington knocks the socks off Kevin Costner (which isn't hard to do) and Zoe Saldana delivers a fantastic performance. AND of course you can't have the experience without the wizards at Weta. You won't be disappointed.