Win.
If you need more convincing that Wins is a terrible stat — I mean, beyond the fact that, going by wins, Jason Marquis is the best pitcher in baseball — well, the baseball gods are glad to oblige. They present to you exhibit A, in which Alan Embree gets a win without throwing even one pitch, and exhibit B, in which Joel Hanrahan earned a win for a team he was not playing for. Excelsior!
Oh, what the hell. Exhibit C: Joel Piniero, who has two shutouts, three complete games, a 1.110 WHIP, a 131 ERA+, and leads the league in losses, with 9.