Aion Gold: The Samurai is considered at par with the Monk with regards
FFXI Jobs: Samurai - Samurai are the followers of the warrior code Bushido. These great Katana yielding martial arts specialists live and fight by the rules of the far Eastern art.
As an Advanced Job, the Samurai is only available Aion Gold after you have reached level 30, and completed the Samurai Quest (starts from Norg).
FFXI Samurai Advantages: With their excellent fighting abilities, the Final Fantasy XI Samurai is considered at par with the Monk with regards to their damage dealing ability.
Their Great Katana is a rival of the Great Swords used by the Paladins, however, if you are up against a great sword, rest assured that the Katana has ample damage dealing ability to out do the Great Sword.
FFXI Samurai are really special against demons. They have job-specific skills to tackle different types of demons. Designer-made stuff in Vana'diel!
As the primary TP providers, the FFXI Samurai can be extremely good as team mates and skill chain initiators.
Samurai/Thief isn't too far behind the above in its benefits. The agility and dexterity added to the FFXI Samurai stats, and the job abilities of the thief, are enough to recommend the job at all levels.