I read them a lot in the 1980s, when my Dad had them all. If I remember right, The White Dragon was one of my favourites. I don't own them now and haven't had the urge to return (unlike the Foundation books which Maddz just posted that I re-read about once a decade and have my father's copies).
I like the core books (Dragonfligtht, Dragonquest and the White Dragon, plus Dragonsdawn (which was an origins story.) )
Wasn't so keen on the spin-offs (Harper of Pern, Meter Reader of Pern, Traffic Warden of Pern etc.)