I am a blacksmith and tbh the crafted armor leaves much to be desired. It is mostly tanking gear and they can get much better stuff pretty quickly in raids. There are some BoP plans that are very good, though they don' require armorsmithing.
The Weaponsmithing items are excellent however expensive. They are perfect for fury or MS warriors, Retribution paladins, or even sword or mace rogues.
If you want to know about the materials required for some of the epics look them up ahead of time as they take quite a bit and it is best to farm the mats instead of buying them.