It's one thing to have bad luck (see Figgins, Smoak trade). But lately, Jack Zduriencik isn't even making trades that look smart at the time. I won't turn this into a 2000 word treatise detailing every move, but I would like to focus on two in particular. The Fister trade was inexcusable. He traded a young, cheap, cost controlled good starter that was still improving. Fister has gone on to be one of the better pitchers in baseball. Zduriencik shouldn't have traded Fister at all, there was no need to, and he traded him for a 4th outfielder. It would be like Seattle trading Earl Thomas for Clinton McDonald.
Now today, Zduriencik just traded his best low cost player (John Jaso) for Mike Morse. The very same Mike Morse that Zduriencik traded away for peanuts three years ago. Mike Morse is older, more expensive, under contract for less time, and has less total value (WAR) than Jaso. You simply can't look at this move and not think "incompetence." It has come to the point where I actually dread hearing that the Mariners are in trade talks. Zduriencik is in a serious rut.
The Fister trade has already hurt the Mariners, and it was obvious the moment it happened that it was a huge mistake. While there is a tiny chance that the Jaso/Morse trade could be Jack's version of the Tapp/Clemons deal, I'd give that a very small chance of happening. John Schneider has a knack for having trades break his way. Jack Zduriencik has not.
I don't know when Zduriencik will be fired, but I am finally convinced that he will be in the near future. Taking an MLB team from the bottom to the top is extremely difficult because of a rich get richer system. It takes a brilliant GM to pull it off, not a guy that shoots himself in the foot more often than he shoots his target.