If i take my example, when i installed the demo at the very begining, its the first thing i changed with the graphical options....
And as Herezy said, I almost immediately switched from normal to inverted because it just feels more intuitive. I think I did that as soon as I played the tutorial, when I was playing around with options.
This.
And Cicero, keyboard blocking is good for your playstyle, but that's basically it. When you move and then block (=move in other direction for a milisecond in your case) you lose speed, and while it might be not important for you as you have low athletics and heavy armour which makes you slow anyway, any more agi-oriented build would suffer more from this, resulting in reduced maneuverability during the fight. So yes, keyboard blocking isn't really viable for most builds.
About inverted attacks, I think the only reason it's effective is because it's rare, as Teeth said.
And the "it makes you hit faster because you turn your camera into your hit" point isn't really sufficient because the time you need to adjust your camera is so tiny compared to the delay your hit has because of the ping (around 40-60). Using inverted from the very start of playing this game, I sometimes end up doing "inverted inverted" attack, for example: doing the left-to-right swing, I move my mouse to the right for the game to register the hit direction, then move my mouse far left and then as the swing animation begins I turn into my swing to the right again - all of this without really hitting any slower overall.