'Sins have a really hard time getting in random PuGs sometimes because there's sooo many of them (and so many of those are absolutely horrible). Too many play their 'sins as kamikaze tank-wanna-bes...... But assassin can be a really strong profession. I like A/R, critical bowsman (don't care for barrage, tho). You can pull awesome damage with the combination and have good self-heal (which will help you get in groups as well as stay alive
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Ritualists have an easier time getting into PuGs, especially if you're a restoration rit. My son has a rit/nec who obtained the Survivor title (legit, no mapping out) using spirits and minions in a highly effective manner. I think that if I decide to resurrect my rit, I want to go channeling.