James T.:

BBJynne:

it was the middle of the troligy, not it's job to finish up loose ends

Then what did it do? 

Lets see:

It gave you some insight on the inner workings of the covenant.

Showed the events of one of the most important events in covenant history: the betrayal of the elites, that lead to the civil war.

Introduced gravemind

Revealed that there were seven rings in total, and place where they all could be activated at the same time

Revealed that the humans had some strong connection to the forerunners.

Gave you a chance to fight along side elites, and hunters. Who didn't get excited when you found out you had hunters that would fight with you?