This post from Muzyka is pretty on point. Very little of the criticism I've seen has been constructive. It's not clear what, exactly, people expected--if the story DAG gets too big, you run out of dev, QA, and voice acting resources.
Mass effect 3 as a whole does tie up quite a large number of previous story threads (Conrad Verner, even!). But the number of earlier choices is just too large to fit them all (or even very many of them) into story variations at the "very end". So they decided to aggregate all those choices into the list of units and resources in the galactic readiness screen.
Mass effect 3 as a whole does tie up quite a large number of previous story threads (Conrad Verner, even!). But the number of earlier choices is just too large to fit them all (or even very many of them) into story variations at the "very end". So they decided to aggregate all those choices into the list of units and resources in the galactic readiness screen.