I like the players. They are very intelligent, know their way around the game, mostly, and they know a lot about Star Trek.
I could listen to the lot at DS9 making Gorn jokes, or discussing IRL problems, or simple Star Trek trivia. While in Sector Space, chat channels, or social zones, I can read people typing good help or having a Star Trek argument.
I've met my fair share of not so nice players but they are mostly pretty good for the reasons you say. if you need help you will 9/10 times actually get help and not a torrent of insults calling you a newb, and many have a good sense of humour.
I definitely agree that STO has more players with a sense of humor that the average gamer. And a lot of players have enthousiasm for Star Trek (and get it). Look at the heated discussions here on Star Trek lore....it really gets people fired up.
I always think that if you (really) like Star Stek, there can't be much wrong with you as a person.