Oh, well once you are a DVCmember and have points you do not deal with the same Central Reservations office that books the Disney packages and regualr WDW resort rooms, you'd be dealing with Member Services.
While they occasionally have their problems, too, I find them in general much better to deal with. They are only open weekdays during normal East Coast business hours or you can request a reservation by email. The emails are generally answered within 2 to 3 business days.
Member Service can also book WDW dining reservations, but not the "packages", like Candlelight Processional or Fantasmic seating, they will transfer or refer you to Central Reservations/Dining.
As far as "problems" with Member Services, you will sometimes get a new person/trainee that is not fully familiar with the
DVC system or gives you incorrect information. However, the majority of CMs I've spoken with have been friendly and well versed in DVC prodedures. There can be some long hold times on the phone, depending on the season/booking window...like for Christmas Week, spring break, etc., but I rarely wait over a minute or two in slower seasons.
As far as Central Reservation not booking your stay, remember that many hotels will not show availability because a percentage of their rooms are "blocked" for
travel agent reservations, as to whether this is the case with Disney, I don't have a clue.