Maybe I misunderstood the system (and with no way of checkin it out myself, having below 1000 karma myself), but I thought users with 1000+ karma would see all comments appear directly on each post and could then decide whether they are "worthy" or not to be shown to everyone.

Thinking about this again I realize that would kind of defeat the whole idea as established users would still see all the "bad" comments, maybe someone can elaborate on how exactly it's supposed to work.