Is Fiers the worst pitcher to throw 2 or more no-hitters? Here's the full list:
Hall of Famers: Addie Joss, Bob Feller, Christy Mathewson, Cy Young, Jim Bunning, Nolan Ryan, Pud Galvin, Randy Johnson, Roy Halladay, Sandy Koufax, Warren Spahn.
Pre-20th century: Adonis Terry, Al Atkinson, Larry Corcoran, Ted Breitenstein
Career numbers of everyone else:
Homer Bailey (89 ERA+)
Bill Stoneman (90 ERA+)
Hideo Nomo (97 ERA+)
Bob Forsch (98 ERA+)
Mike Fiers (99 ERA+)
Frank Smith (101 ERA+)
Carl Erskine (101 ERA+)
Tim Lincecum (104 ERA+)
Ken Holtzman (105 ERA+)
Steve Busby (105 ERA+)
Johnny Vander Meer (107 ERA+)
Don Wilson (109 ERA+)
Allie Reynolds (109 ERA+)
Jake Arrieta (113 ERA+)
Dutch Leonard (115 ERA+)
Jim Maloney (115 ERA+)
Mark Buehrle (117 ERA+)
Virgil Trucks (117 ERA+)
Justin Verlander (126 ERA+)
Max Scherzer (130 ERA+)
Looks like it's Bailey, although he has a chance to turn it around a little and leave it to Bill Stoneman. Fiers has been a better pitcher than I thought.