I voted for good. It's a useful feat in certain situations, useless in others. It's more useful for NPCs (with access to magic weapon or greater magic weapon) than PCs and for higher level characters than lower level characters.
Tactically, sundering weapons is useful if your opponent has a very good weapon or is significantly more deadly with his primary weapon than with his backups (both of which are usually true at higher levels). At low and mid levels, however, the sunder attack is often an attack that could have killed the opponent (or at least contributed to his dropping one or two rounds sooner) but instead reduced his offensive capability.