Since its implementation in late 1998 the posting system has been heavily criticized. Ichiro Suzuki's agent remarked that "the player literally gets zero advantage from [the posting system]... the Japanese teams benefit by holding the players hostage". Don Nomura called the process a "slave auction".[10] Much of the criticism of the system stems from its forcing NPB players to negotiate their contracts solely with the MLB team that submitted the highest bid. The Japan Times columnist Marty Kuehnert believes that since no other team is allowed to submit competitive counter-offers, negotiations result in salaries below the player's market value. Kuehnert also believes the system fosters a "take-it-or-leave-it" situation; if the team and the player have not finalized contract negotiations by the end of a 30-day period, the team can make a low offer knowing that the player's only other option is to play in Japan for another year.[59] It has been suggested that this is a violation of the Anti-Monopoly Act, a Japanese antitrust law that prohibits parties from signing "an international agreement or international contract which contains such matters as constitute an unreasonable restraint of trade or unfair business practices".[60]

The Japanese Professional Baseball Players Association (JPBPA) was not consulted before the system was implemented by NPB club owners, and did not subsequently ratify it.[61] Since its introduction JPBPA has expressed many concerns, likening the process to "human trafficking".[62] Agreeing that the system takes unfair advantage of NPB players, the Major League Baseball Players Association (MLBPA) offered to help JPBPA fight the posting system in court. However, according to one JPBPA official, the Japanese court process is too long and involved; therefore, the "problem can't be helped".[61]

Yomiuri Giants club representative Hidetoshi Kiyotake has expressed dislike of the system, because it enables Major League Baseball to poach players from Japan. By using the posting system, he says, Japanese teams make a profit in the short term, but by allowing Japan's best players to be sold to MLB, NPB teams and Japanese baseball suffer in the longer term.[63] When Giants pitcher Koji Uehara asked to be posted in 2005 Kiyotake denied his request, saying: "We don't recognize the posting system. I've said from the beginning that this is out of the question."[19]business opportunity
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