Turns out the 3D glasses give me dizziness and migraines.
The film itself had highs and lows. Vivid colors, detailed scenery, and interesting mechanical designs were all slick. Plot wasn't the most gripping thing ever, feels a bit like Cameron saw some anime and thought "I can do that!" and [spoiler]"Lets kill off most of the protagonists!"[/spoiler]
*** Short Version of Plot***
The whole beginning feels rushed. Shut up Shinji, get in the Na'vi. Current state of humanity is kept very brief.
Humans want resources. Blue guys are in the way.
Hero: Okay, I'm gonna be a blue guy, I'll go talk to them. For three months.
Corp Guy & Military Guy: Diplomacy takes too long, lets just use the hired guns!
War. Ever want to see a bunch of Apache Gunships fight indians?
More movies need giant robot knife fights.
End.
It takes two and a half hours (plus 30 minutes of previews) to do that.