Perhaps I am in the minority -- am very satisfied with NCS/NGC response times.
While I am not totally pleased over some of the results in that I just "know" some of them should be higher (in grade), I have no problems with the response times of NCS and NGC (and even PCGS).
I sent 2 quarters raw, a 50c piece raw and two Morgans raw (total of 5 coins) to NGC for grading. Sent Registered mail 02/13/2006. I received notification today (03/06/07) that the coins were shipped.
Maybe I am counting wrong, but that adds up to between 13 and 15 working days -- depending on how many working days (or not) that Florida/NGC counts for the three President's day and Valentines Day and Ash Wednesday and whether or not Monday counts as a day of grading.
I have never experienced a long delay. Perhaps it is because I almost always use Registered or Priority mail.
Then, again, maybe I am just lucky and there is a silver cloud hovering over my head :-)