The only difference between dx 9 and dx 10 is watter?? Nothing more?:)

Why without motion blur?

Ehm.. because it will affect the perfomance or no?? What exactly motion blur does? Does it makes the graphics beter??? I tested it on 1280x1024 high settings with FSAA and 16XAF and it wasnt playble! But it is playble 1024x768 high settings without motion blur AA and AF

I play most of the game without motion blurr.
Don't see much differense.

But motion blur makes the game look smoother, and there are not many games that have it, but if you have 15 fps at a place, put motion blur on and it gets much better, a game is very very laggy in 15 fps, but with motion blur, your eyes don´t have to suffer.

Easier explaination: Turn your head fast in reality, then the environment gets a bit blurry, it´s the same in the game. When somthing/someone moves fast you get motion blur.

But I don´t think motion blur affects the performance at all, try to put it on, the game will feel smoother.

Yes now the game runs faster with motion blur!! I am on level 5 now!!

Well, not faster, but smoother ;)

Stutter is bad...
 

Still,the stutter is pretty bad.I mean,the game loads when an enemy dies,it loads when you open a door(no script sequence),and lol it stutters when you shoot....hope the new patch will bring some optimization into the game.

Don´t really know what you mean, is the game loading all the time?
It doesn´t for me, or very fast, so I don´t have time to notice it.