Not every offseason signing is going to be perfect. Even with all the scouting tools out there, it's still difficult to properly evaluate a player and predict his performance going forward. Sabermetricians like Bill James get paid good money to predict what the players are going to accomplish, but the reality is that it's pretty much a crapshoot.
Most of the major free agents have signed on with new teams already and that means this is a good opportunity to evaluate those moves. We can't predict exactly what these 10 players will do, but we can say with somewhat more certainty that their new teams will regret signing them.
Here's a look at those 10 players, and remember: general managers are human beings too.