Deny I think that all pictures will be terrible apart from infinite focus (ie far away buildings etc) without autofocus. Try switching the image quality to 5mp, turn on Macro or Automatic mode, and turn off the flash. Half press the button till the lines turn green and the chime sounds and then slowly press the shutter button the whole way down without moving the N900.
I would agree with you if you were trying to shoot moving objects on the street but a document on a desk is as controlled circumstances as you can get.