The rewards for this quest (faction, plat, and experience) are given to you as soon as you loot the seventh piece of meat. No need to go back to the quest giver to do a hand-in. Quest givers reject the meat if you do try to hand them in. No other uses that I've found for the meat outside of the quest.
Did this solo with a cleric merc as a level 56 SK. Used a bow with long range to pull to alcove to the right of zone-in as you face the temple. The left side has the possibility of two roaming drakes as adds when the mobs start to flee. As mentioned by others, these mobs are all pretty fast. None gated on me (tried 2 novices), so I was lucky there.
The majority of the goblins are fairly easy (dark blue at level 56), with the exception of the Stillmoon dirt tenders. They are clerics and cast Retribution like mad. They eventually run out of mana after 2-3 cycles of healing themselves back to near full.
Hard to tell how much faction this quest now grants. I was apprehensive to the Dark Reign going into the quest (was my first quest for faction) and remained at apprehensive upon completion.