I watched this movie in IMAX 3D and found that the visuals are incredibly stunning and immersive. I felt like being transported into another world for 3 hrs! Lol.
However, the story line imay not be as good as the the first Avatar movie 2009. This is a continuation of the 1st movie so if you have missed it, you may not fully understand the plot.
Anyway, I have no regrets watching it in IMAX 3D and found that it is really worth the extra price for the ticket. You need to get a good seat at the theatre which is somewhere in the centre of the theatre Hall to get the best visual effect.