The rotation was built with the success of the pitchers from last year in mind and the hope that some of the guys (Chacin, Miley, Guerra, Suter, Woodruff etc..) would break out and be a formable back end of the rotation pieces. So far the top guys haven't pitched well and the bottom guys have been even worse. It's been a perfect storm of just flat out bad pitching. Even signing one of Cobb, Darvish, Arrieta doesn't save this team from how they have pitched to start this season. Everyone just needs to go out and do their jobs better.