Making this post mainly to really summarize these for myself, but also since I haven't made a post here forever. About...6 months ago? 8? Grefter gave me a long list of fantasy authors to try out! All of which I think I basically have by this point, so...(in semi generalized order of reading)
Deverry Series/Katherine Kerr (12 or 13 books?): Read all but the last, which came out within the past year or so and therefore is only hardback. Didn't like the series enough to grapple with a hardback book. Biggest standout feature is how realistic it is. Author was potentially some kind of medieval historian because everything feels so grounded. Deals with reincarnation cycles, but also has the least threatening villains ever. The magic isn't completely potent at all, but the villains are so lolzy that even the weak magic seems to completely over power them. Series worked very well overall despite this; just makes it feel like some kind of odd historical narrative. Too much pointless dragon hype instance 1. None of the books were best really as they were kind of all the same.
Riftwar Saga (4 Books, Don't remember the author off the of my head): Unlike Deverry series where the books are very even, Riftwar Saga is an exercise is great uneveness. Book 1 was solid setup, book 2 has the fascinating otherworld parts, book 3 has some quirky exploration but kind of ditches the book interested world, and book 4 falls apart! Granted, it can be hard to end a fantasy series, but felt like the author may have started drugs during the last book or something. Book 2 was by far the best.
The Caves of Eileanen/Kate Forscyth (6 books): No idea if the series was called, but going with my gut reaction. Took a while to deal with the damn subsitution of "ken" for "know." Otherwise, fairly entertaining series that was decently fast paced and interesting. Isabeau for the most part was great. Parts of book 6 kind of came out of nowhere, but it worked. Too much pointless dragon hype instance 2. Book 4 (at least I think it was book 4) was definitely the stand out for Isabeau's time with the Khan'coban.
The Crown of Stars/Kate Elliot (7 books): WIN. Awesome, awesome overall series. Great combo of epic with solidly rounded and not out there villains, several very interesting arcs and lots of twists and turns. I did finish the 7th book with 2 major questions, but looking online tells me one was never answered and rechecking the book heavily implies that the other wasn't either. Books 1 and 4 were likely the best, although I thought the series carried itself very well all the way through. +2 points just for going and hyping some other dragon animal besides a dragon! +2 more for what she did with the map. Disapointed that book 6 and 7 were so relatively short, but then I read that they were originally going to be one 1200 page book (Which is one, because the ending of book 5 was colossal enough to have milked out even more; Then again, I did find the world fascinating, so that could be why I wouldn't have minded 6 and 7 being 800-900 pages like the others).
The Way of Kings/Joe Abercrombie (3 books): Solid intro for a new writer. The main cast is immensely likable, so that was well done. Gut says that I think Grefter would enjoy at least the first two books of this series. Third kind of unraveled a little unfortuantely.
Rhiannon's Ride/Kate Forscyth (3 books): Follow up to Caves of Eileanen. Book 1 is fantastic. Unique, interesting, and very tense. Books 2-3 unravel though. Book 2 features formerly smart characters ignoring way too many premonitions. Book 3 features both annoying ressurection and a nearly pointless trip back through time! The drop between books was incredible, especially since book 1 may have been the best book she wrote.
Watcher of the Dead/JV Jones- Book 4 of the series. Was really looking forward to this because I felt like the series has actually been one of the best fantasy ones I've read. It's very unique and fast paced. Unfortunately, I feel about maybe 1/3 of the plot threads stalled a little in this book and that it should have been longer. I really like what she did with the plot threads that didn't stall (Well...Raif should have gotten more done), but I felt like the previous books accomplished more. I have no idea how long this series is supposed to be, but I'm guessing not 5 books since I just don't see all of the story wrapping up in 1 book.
Spirit Gate/Kate Elliot (3 books): Finishing up book 1. Big step down from Crown of Stars. The world feels less real (CoS was able to pretty quickly craft a reasonable political setup and give fairly strong reasons for it). Suppose this could be a setup book, but it's a bit underwhelming.
Know I'm forgetting some of the other books he recommended, but so it goes.