I have noticed a couple of things:
1) if you pug people, it'll find an "average" gearscore and put people at each extreme of that (ie if you're low, you're going to get at least one really really high person, and vice versa - this is probably to increase success rates).
2) When I run solo - it appears my guildies get the SAME instances in the same time frame. I notice this by who gets what achievement.
3) It seems to throw you into instances that your NEED achivements for. Has anyone considered that they get Occulas so much is becuase there are five achievements for that damn place, and most of you probably have zero of them? I get Azjol-Nerub a lot, and I have not completed the first boss achivement (watch him die).
Food for thought.
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