PuG's suck in general. This is because they lack the ability to think. Leave them alone in their little world and laugh to yourself about how they're spending twice as much time and effort to get something done as you.
Soul Reaping is amazing, don't underestimate it. In alot of HM threads, people (including me) recommend using 3 Necromancers (often referred to as 'Sabway'), I'll get the link when I get around to it. It's based on having soul reaping trigger off frequently to power their insane abilities.
Don't know too much about Rit's tbh, but Channeling/Resto combos work well apparently. Ancestor's Rage and Splinter Weapon seem to be good skills, I'd go with them.
EDIT: Here's the link to the 'Sabway' build I mentioned, just scroll down to Sab's first post.
EDIT: Wow, I'm an idiot, this is what happens when you do too much at once. The link posted by withcblade is outdated, this one is updated with hex removal and stuff.
http://www.guildwarsguru.com/forum/s...php?t=10200851