There is Good grounds to use manual focus dont get me wrong there is still a place for it. I just have this debate often with people who call themselves pure photographers that will rather miss a shot because they refuse to use auto focus. I dont get people that refuse to use it.
I have never seen anyone have consistantly sharp images from manual focus yeah maybe you get 1 or 2 in a row (handheld) But then why bother buying an expensive DSLR camera just to use a quarter of it.
If your saying your autofocus is faulty and does not work then yes use manual focus ( I still dont know why you have not replaced your camera while it is still under warranty.)
If you are a Purist believer then so be it but then for your money you could have bought a better manual focussing camera like some of the early Nikon D1s full frame Canon early generation digital cameras, You could have a good camera (not that anything is wrong with yours) and bought 10 manual focus old lenses for the price of 1 modern lens.
It is your choice at the end of the day it is your skill but I think whilst you are learning photography you should use the assistance of auto focusing.
if you are doing it to learn then I fully support that every photographer should learn manual focusing it does come in handy but from what I have seen in the pics you have posted 95% of them are soft focused and not DOF blurry i bought it up in this post
http://www.photoshopgurus.com/forum...camera-repaired-me-thinks.html#post1533584583
fearing for my life that you would bite my head off you were not so calm back then lol.
I dont believe in the mentality of oh its ok I will fix it in photoshop as sharpening in PP comes with more problems of its own.
So yes use manual focusing to learn it as it will take you a while to learn on a dx camera it is about 75% harder than a full frame you are looking through a tiny view finder to assess the sharpness of a large image. but Dont miss shots because of your pride.
end of subject for me or we will be going in circles.
there is a place for both don't rule out auto focus because you think it is beneath you.