I am often swayed by the critic blurbs on movie boxes. The box for "Dark City" had a Rodger Ebert quote in which he called it the best film of 1998. I must admit that made me take notice. I looked at the back of the box and it said the Director, Alex Proyas, had directed "The Crow." I t also had a commentary track by Ebert. I thoght, "Wow, If he did a commentary trck he must reall like this movie." So I bought it. And I do like it. But I wouldn't have given it a second glance if not for the blurb.
Blurbs also help me avoid bad choices. If the only blurb on the box is from some obscure fanboy of a critic, in some one-horse-town; I know the movie has to be crap. "That's the best they could do, 'Dave' from 'MovieGuy.com,' says 'it's a blast' please."