Accuracy definitely has a weight... Every MMO that uses a Accuracy system and has had it figured out will prove you wrong with that. The high number I used was because Accuracy is such a mandatory stat, that until it is capped, it is a really highly weighted stat. Take WoW for example, I remember times when Accuracy or Expertise could rise over the main stat because it is just too important not to have capped, however falls quickly to 0 once it is met.
I agree with what you said in regards to selecting what is better. You cannot select an item as "Best in Slot" by just looking it solely, you have to look at the entire set, however looking at the items compared just stat per stat, with stat weights that have been calculated using your own gear, a clear victor can be chosen.
