The vast majority of people I've met in SL have been friendly, interesting, and helpful. (That may be skewed by not counting people who have pushed me about while trying to get somewhere as people I've met, but that's OK by me. In any case such people may be victims of serious lag.)
Some stand out as particularly kind and friendly—a friend I've made on SL, Mordecai, very much so. Were it not for SL, I'd never have met him, and would be much the poorer for it. He's started a blog about his SL experiences, and I hope you'll read it.
I must admit that I'm not used to such praise as he bestows on me—as the cliché goes, it's enough to turn a girl's head. I must learn to relax and accept compliments with grace, and even enjoy them.