I disagree completely with this statement. Although it wasn't as amazing as some say and I saw it in 3d and in the biggest theater around me (and that didn't help the movie at all), the visuals were still very good, but for me, the story was very lacking.
I have no doubt the sequel will look visually incredible, I just want a story that resonates with me so I can enjoy it more.
I want it to be a good movie and for me, Cameron delivered 99% of the time, so I am pretty confident that Avatar 2 will be better than the first.