kungur... this idea that stat weights are the "proper" way to rank gear is not true, it is just one way to rank gear, and not that great a way at that. We wrote an article about why we stopped using them back in december: http://blog.askmrrobot.com/machine-learning/
Also, we'll be adding a button in the near future for you to export stat weights to e.g. Pawn, if you really like stat weights. It can be useful for a quick and rough estimate in-game right when an item drops, which you can then double check using the complete optimizer on our site.