The thing I've heard most often about Hemlock Grove sounds something like this, "It's really, REALLY bad! Oh man, it was so terrible! I watched the whole thing in like 2 days and it sucked! I can't wait for Season 2--it's gonna be terrible!"
I found Hemlock Grove interesting, the story progressed really slowly, luckily Netflix allows all-you-can-eat watching so I end up watching the whole season in a couple of weeks - where if I had to wait a week in between episodes I likely wouldn't have bothered. Overall I thought the production quality was high with good actors/acting and I liked that it had an unusual story-line even though I don't really like that genre. Will definitely watch next season, tho there are also better things on Netflix.
(only slightly exaggerated)