Use 'praiseworthy' for expressing positive recognition, implying something is not only good but also deserving of praise. His decision to volunteer was praiseworthy.
Pro Tip 2/3
Selective Praise
'Praiseworthy' suggests selective approval, not everything well done is called praiseworthy. Despite many entries, only a few were considered praiseworthy.
Pro Tip 3/3
Measured Enthusiasm
'Praiseworthy' carries a restrained enthusiasm, less strong than 'extraordinary' or 'remarkable'. Her consistent performance was praiseworthy but not extraordinary.