Seen it on imax 3d today. Special effects are years beyond anything else (typical Cameron movie ^^). Makes the planet earth series on blu-ray look fake

. I also liked how they used the 3d just to create a more realistic depth of field and not some random crap flying 'into' the cinema.
The story is super cheesy yea (a bit like the Abyss without the water and more action) and so are the dialogues, but its a Cameron movie after all

I would rate it below Terminator 2, Terminator and Aliens, around the same level as True Lies and above the Abyss and Titanic.
Technically its a look into the future and therefor it will be seen as an important movie, but its not like the Matrix, Terminator or Die Hard for example which changed moviemaking on more levels than just the techincal part.