I joined over a year ago, and have really enjoyed my time in the Community so far. I have characters in all three of the Republic guilds. My reason for joining was simple; all the members I met in WZ, FPs and Ops were friendly folks and skilled players. They seemed the kind of people you wanted to surround yourself with for group activities in-game.
Since joining, I've come to appreciate the impressive "game within a game" element to the Jedi Order Community. The Master/Learner mentoring system coupled with the in-guild Trials of Rank, the various and sundry RP events covering Recruiting/Initiation, GSF, PvP, and Conquest, have all added favorably to my time in SWTOR.
Themys/Fliss/Betsalel/Lavrentyy/Asad'ullah et al