Gibbons never calls the hit and run (as opposed to the other teams), chooses doubtful match-ups such as putting Valencia VS RHP all the time, putting Loup VS back to back righties in small ballparks, etc. He's possibly one of the worst managers in the AL, no joke.
However, even if you fire him, this team in its current state will still blow. Another starting pitcher is a must if this team wants to be relevant in 2015. And get rid of Dickey or Buerlhe ASAP, preferably Buerlhe.