$180 for a story we already know. Mass Effect was brand new content. That's not a fair comparison.
But this is a re-imagining. Will the overall story be the same? Sure. But the journey looks like it's shaping up to be a completely different experience.
By this same logic why would FFVIIr be $60 if it were released as a single game? We already know the story.
I know it's not 1:1, but it is completely fair to compare them. Of course, this is assuming what they're saying is true and all that jazz.