I tried one PG book (the first book in the Wildacre trilogy) and couldn't make it to page 30. Her sense of history rang all my history student red flags.
I made it through three of her "Cousin's War" series, and found them alright but nothing special. However, I was furious over her depiction of Elizabeth of York in The White Princess.
There have been PGs I've liked (particularly Virgin Earth), but I'm not touching this one with a 10-foot pole. (Hated the first book of Wildacre, btw. That was an early-stage DNF. I obviously don't like incest as much as Ms. Gregory.)