Turning off auto correction can be useful to people who normally type in a different language. It can get very annoying when it corrects words you don’t want corrected. What pisses me off is how it still keeps correcting me even though I clearly deleted the word and retyped it numerous times exactly how I want it. I thought a smartphone is smartphone because it is suppose to understand what you want and don’t want? Personally I think it’s just Samsung’s Touchwhiz interface that is causing the annoying predictive text issue. I normally flash a custom pure android rom but my Note 3’s AT&T bootloaders are locked so until an unlock comes out, I am stuck with Samsung’s default Touchwhiz. To disable the predictive text on the Galaxy Note 3.
(For Touchwhiz users)
Go to Settings > Controls > Language and input > Samsung Keyboard > Predictive text, turn it OFF. This is pretty much same way as for other Galaxy Touchwhiz devices. Video below is of the Note 2 but it also applies to Note 3.