When it comes to item quality WoTLK Gold, the equipment that is equipped will come with five quality levels for consumables like potions will come with three. Each quality level will increase its effectiveness by a tiny amount, with Blizzard declaring that the aim in the process is to "have quality matter enough for it to warrant the effort to improve the quality of your item, without having the gains be so great that the lowest quality versions don't feel worth it." For gear, higher quality items will result in a higher quality level for the item, while higher quality consumables could have longer durations or additional uses.
The crafting of recipes can have difficult time as well as the quality of the product crafted is determined by the level of skill required by the base profession along with the quality of the reagents used that are specially designed for finishing, profession gear that may give special skill bonuses, bonuses that are derived from consumables, and professional specialization. There's also a little chance of randomness in crafting that can make result in the product being either better or worse than you expected. A brand new crafting stat, Inspiration, has a chance of granting extra skill bonuses when crafting along with stats that could allow crafting items to consume less resources, and also to create more items, and boost the speed of crafting.
Blizzard says it will be possible to create Mythic high-quality gear for raiding (aka the best gear in the game) by using this crafting mechanism, but that it will not be simple. To accomplish this one would have to be specialized in the type of gear and acquire the best required reagents, as well as top-quality optional reagentsand the most professional equipment available. In further, players may need to get a little lucky by using an Inspiration program or use a rare finishing reagent in order to enhance the equipment to ensure they are making it of the top quality.
There are many more details in the entire blog post cheap WoTLK Gold, including that players only have to increase their professions to the point where they will be able to learn all available crafting recipes for their profession and a new type of consumable called Phials will be replacing Flasks.