I loved this episode, it had all the elements to a great episode; a good story on the beach, good character development, and a goof flashback (manditory for a great episode).
I loved the suspense in this episode and the plot twist from who the hell is this guy, to o okay that's who that guy is, to so why's he here, to o he doesn't exsist.
A Hurley episode is impossible to hate with no exception (with exception to Everbody Hates Hugo:P). I loved the connection between Libby and Hurley too. And who could forget the Sawyer takle.
Dr. Brooks: Dave isn't your friend Hugo... because Dave doesn't exsist.