The instance teaches people the basics of group play very well. It is not too difficult but requires people to perform multiple roles at all times. Tanks have to select targets correctly and manage aggro on multiple mobs. Healers have to heal. DPS have to DD but they also act as the Crowd Control with sleep spells. At most you have to manage 3 mobs of Elite level which is not too hard but if not controlled can lead to a wipe. Loot is not great but the XP makes up for that. It makes getting the best gear a challenge at the moment, as you need rare Crits to occur and the rate of success is somewhere around 20% World of Warcraft Gold. You can literally spend fortunes trying to create a set of gear which will be superseded in 5 levels by the next set. You can minimise the cost by harvesting all the components yourself, though some are item drops off mobs so you will need to buy those or spend endless time fighting.
The top-end gear that can be crafted is substantially better in quality than the gear you can get in regular quests or drops. There is no interactive element to influence failure or success. The higher level you are in your craft, the more likely your combine will succeed. It is rumoured that within 10 levels of the level of the item youre crafting is the sweetspot for crits but I have not seen empirical evidence to confirm this.