Forget all of the negative reviews - Avatar Extended Collector Edition is a must see film.
Having seen Avatar several times at an IMAX, I wasn't prepared for how brilliant this would look on blu ray at home. The clarity and colours are amazing, and yes it's not in 3D, but this version is amazingly detailed and allows you to look around the screen and see much more (even I spotted new things, and I've seen Avatar many times).
This collectors extended version of the film is long - even longer than the re-release in August. So the big question is, is it worth watching? My opinion is yes, this version with extended battle and hunting scenes adds so much more depth to the movie. Grace's character is given more time and we find out about what happened to her school, which adds depth to her and Neytiri's characters. It shows us how Jake lives before coming to Pandora, and makes his joy at walking again and ultimately becoming one of the people so much more poignant. Tsu'tey's final scene is very moving, and throughout the film there are many moments that will bring tears to the eyes. It's such a pity these scenes ended up on the cutting room floor in the original version, since they add so much to the overall experience.
This is an amazing and beautiful film, which is so emersive and hugely enjoyable. It will be a long time before we receive another visual treat like this one(probably in 2014 when Avatar 2 is released). So I'd advise any waverers to not miss out - purchase the blu ray, and then sit back and enjoy!