They're still impersonal.
Unlike the reviews when you go around to a friends BBQ or are at an event, and you say "Oh hey Sarah, I see you are driving the new X".
Then they proceed to tell you how great/bad or mediocre it is.
Surprised no-one has been able to engineer a more personable review mechanic, then again with all the privacy concerns. Do you really want to know what your friends are buying, and equally for them to know what you are buying too.