Beaten to it... darn.
Also, 'better' is a highly subjective term when used that way. NIN being made into a tank by the players, imo, made the game better. If we hadn't done that then we'd have one less tank job in a game dominated by DDs. If SE wanted NIN to be played as a DD then they should've made the tools for NIN to do damage easier to obtain and use effectively. Shuriken were always stupid to obtain after a certain point, there's no throwing WS for damage, spinning the wheel is expensive, etc. Had they made NIN tools/shuriken available from NPC from the get-go we may have seen NIN in a DD role.
If SE really wanted NIN to be a DD and not a tank, then the fact that we gravitated towards tanking with it fairly quickly means they failed in their design of the job and its tools. SE made a screwdriver by mistake.