In 2012, Google did away with anonymous Google Maps reviews from "A Google User" or at least they did with some bugs here and there but for the most part, you did not see reviews from anonymous users, such as the "A Google User" account.
But it seems Google might be bringing it back.
Phil Rozek from Local Visibility Systems posted on Local Search Forums that he has seen examples of A Google User showing up in the reviews in Google Maps. I noticed a few also over the past few days showing "A Google User."
Here is a screen shot from Phil:
Have you seen more of these reviews labeled as coming from "A Google User"?
Forum discussion at Local Search Forums.