The character that these old datsuns have make them feel alive, Every truck Ive had has its own personality. I feel like they are more than cars and trucks but an extension of their owners. I keep trying other cars but datsuns always drag me back into the understanding that Im a datsun guy.
Also, datsun enthusiasts seem to be more respectful of one another. Unlike other car enthusiasts, certain cars seem to draw douche bags for some reason.
Datsuns run and run and run... seems like if you picked a datsun from a junk yard, more often than not it would run with minor coaxing and get you home, it might smoke or something but that fucker will RUN!
they are affordable, some models (510, Z, Roadster) are a little more spendy from the start, but all in all parts are cheap, and there is always the chance that some old farmer or something is ready to give up their "old shitty datsun" for pennys on the dollar, and you might be in the right place at the right time :)
and finally im different. I could save up for a honda or mustang or whatever but thats what everybody else likes. If I followed all the trends I wouldnt be the awesome individual I am. Datsuns are underdogs, and underdogs are cool. :)