Avatar - It was a futuristic Pocahontas and i think it made so much money because majority of people bought 3D tickets which is like 1.5 times the price of the standard.
Titanic - I felt like I was watching a reenacting documentary. I love watching documentaries and I've enjoyed many of them more than Titanic.
I love James Cameron movies but not those. Come back to Terminator (it really needs help) and Aliens please!!