I'll agree with the other posters that this gen Legacy is pretty bland (previous gen was much sharper to my eyes), and the powertrain/specs are pedestrian (except for AWD of course).
And the Legacy certainly isn't selling well for Subaru - but they are doing REALLY well (by Subaru standards, anyway) with some of their other vehicles (Impreza, Forester, Outback). And none of those vehicles have class-leading powertrains either - but they are all priced well relative to the competition. That has been the Legacy's downfall for a long time - it was priced $2000 above comparable midsize sedans. "But it comes with AWD, which is worth $2000..." says the Subaru salesman, "so it's really priced the same". But the powertrain, interior quality, and feature list lagged behind (at least some) of the competition - so you'd be paying $2000 more for AWD, but getting a "cheaper" feeling vehicle. At least the new pricing will minimize the difference.
I'm surprised that more MNFRs don't affer AWD on their midsize sedans - maybe they look at Subaru and see their lack of success in the midsize market? Or is this market too price-conscious? Or do they not want to cannabalize sales from their more profitable AWD crossovers?