As others have said, when he was on he was one of the best strike-out relievers I ever saw. When he wasn't he was responsible for some of the most jaw dropping blown saves of all time. My favorite memory was having this discussion with a woman at a spring training game a couple of years ago. A few innings later the woman introduced herself as Matt Thornton's mother.
That said, I have a feeling that we'll miss Matt out there in the bullpen. It will be like phantom limb syndrome.
Final 2014 Home Attendance Record 5-11.