I finally saw Avatar. My advice is -- particularly if you're seeing it with kids -- leave the theater at the point right after the first big explosion. At that point you have seen everything original and inspiring, and you can walk out feeling invigorated and inspired by the visuals, and forget all about the toy plot. Every detail after that point rings false. It just keeps getting dumber and dumber until it's just a parody of every other Hollywood explosions movie.
Seriously, there are two movies here. The first is beautiful. The second is ugly and stupid. There are much better things to do with that final half hour than getting dragged through Hollywood's gutter.