It didn't take Wayward Pines long to make a nose dive into mediocrity. Episode 1 was intriguing, showing promise and originality, but given the escalating list of problems thereafter, the minor sins from the beginning are all back on the table.
At the end of episode 4, the creators gave us another hint of what's on the other side of "The Wall." With this I’ve developed my theory of what's going on. It's a pretty interesting idea, if I say so myself, although reminiscent of Lost and Under the Dome.