What makes a pair of jeans quality? is it just construction and the denim used? or is there something eles to it?
Pretty much. Of course fit counts for something, too, but there are plenty of low-quality jeans out there with decent cuts.
edit: is raw usually better than washed?
If you have the patience to fade the jeans yourself, and if your lifestyle is conducive to getting the type of fades that you want, then raw is better, because the fades will match up to your body.
If you don't have the time or patience for your jeans to fade through wear, or if you've been historically unhappy with the fades that you've gotten in the past, you're probably better off going with washed.