The director of EX4 is Scott Waugh, relatively unknown to most people. He started out as a stunt man in the business, and later got into producing. He has directed only 4 feature films: Act of Valor, Need for Speed, 6 Below: Miracle on the Mountain, and the upcoming Snafu.
Snafu is the modified "Ex-Baghdad" that Stallone was supposed to star in with Jackie Chan at one point. Sly dropped out, and they replaced him with John Cena.
I've seen Need For Speed and Act of Valor, but I can't remember much about either one. Waugh appears to be another cheap director for hire that Avi Lerner grabbed. Now maybe, just maybe, he has a great vision that will translate nicely to the big screen, but that remains to be seen.