Walkscore isn't a realistic measure of anything.

I once lived in a place with a Walkscore of 80+. Looking at the details of the score, it was largely because Walkscore counts pornography shops as bookstores.

Along those lines, I imagine Walkscore also counts peep shows as movie theaters, and strip clubs as general family entertainment centers.

Meanwhile, in Seattle it was 2 miles to get to the grocery store and took all day while dealing with city car traffic.

When I lived in Seattle, I didn't even own a car. I could get everywhere I need to on a bus, or train, or walking. Perhaps you have a different definition of "downtown" than where I lived. If you were two miles away from the Whole Foods on Westlake, then you weren't downtown.