I had problems with client machines not downloading drivers, it was a combination of not picking the right drivers to start with and went to using the universal print driver for all our HP printers. But even then some needed the postscript driver and others needed the PCL driver. We also have about 8 HP 2600's (no print processor) which will not work shared from a 2008r2 server so they remain on a 2003 box and oddly work alright with the old driver, we also had to inject the said driver into the image as it would also not download from the 2003 box. Lots of tweaking with point and print restrictions and the other settings for printers in group policy finally solved all the problems.
What issues did you have with printers and what did you do to resolve that ?