Also a surprisingly advanced and customizable... 'class' system, which was really more like a whole bunch of branching skill trees you could mix and match basically various ranks of... allowing many weird, but often effective, hyrbrids of 'classes' that... could either focus on one main 'class', but augment it with certain abilities from other 'classes'...

And then the Combat Upgrade happened, and everything got streamlined.

Also... being a Jedi/Sith used to be... exceptionally rare and difficult to pull off.

IIRC, basically, some kind of insane random seed type thing gave each of your characters a very, very tiny chance of being force sensitive... but you wouldn't even know this unless you also found basically a hidden event/questline, and then that would unlock a whole set of force skill trees, allowing for a range of jedi to sith abilities, with some kind of mix effectively being a 'gray' jedi.

Finally... SWG ... still appears to me to be the only MMO that actually attempted to implement a working, player vs player, bounty hunting and tracking system, within an mmo... as a core game mechanic of a player 'class'.

Though I haven't played all mmos, so I may be wrong about that.

... Also an entire skill tree for basically being a mayor and running your own player built town. A whole skill tree dedicated to like... administrative capacity and zoning laws.

Do MMOs even... do player built cities anymore? Or did they just mostly switch over to 'you have a house in the set aside 'suburb' instance'?