I liked CC1 and CC2 very much. They were great inspirational books for me.
I actually disliked CC Revised.
Stat's didn't get more right, just different way wrong. And the way hag templates were, didn't exactly feel good idea.
CC3 failed to to impress me as much as CC1 and CC2 had. Partially because it lacked chaotic good and chaotic neutral outsiders among other things. There were few great critters, but it didn't feel as imaginative and inspired than prior books had.
I liked the way monsters were presented, monster manuals feel to me a bit statblockish, there ain't enough monster background. What I loved about CC:s monsters was that extra story, that helped to tie them better into the world. And generally gave them more feeling.
Continues errors with rules made be go like "wow, do these people ever play D&D?".
All in all, I was really waiting for C&C 4.
R&R 1 and 2 (to some extent) were great books. Hehe, we have foundly nicknamed them "Book of Broken Spells 1 & 2". They have been used (and abused) so much in games I've been to. I like Malhavoc spells too, though they aren't as catching as R&R:s.
I didn't like all new plot-stuff that was in R&R 2. Most of it was really cool.
R&R 3 book I was really waiting for.
I loved the Ghelspad Gazetter.
Mithril book was good enough, I didn't expect continets only paladin-city to be so special, and it succeeded at being better book than I had thought (there was the first issue, missing npc:s. Only one of them was fixed in web "extra")
Hollowfaust was good book. Perhaps not the best place to start a game for all types of parties. I had some issues with Nemorga-power-up, but hey, authors pet-god apperantly, what can I say.
Both starting locations also are pretty lawful.
After these books Scarn extreme makeover - world edition (to give this some reality show spin) started.
Campaing Setting books weren't quite the same world. I found those actually pretty boring and lacking some intereresting ideas spell and monster books had hinted at. They were good books, though despite the changes and all those paladin prestige classes (doh, as if didn't have enough of them).
Divane and Defeated was both great and somewhat off direction. Still, despite my disagreements with some mythology, statting the divane and humancentric titans, I really loved that book. And I had no problems adjusting some ideas fit my campaing.
(mine and my friend's had been going on for quite a long time at this point).
After this the world went to different direction, and fewer and fewer books got any use as they were.
Some publishing ideas make me really wonder.
Now, why they didn't write about Vesh, Albadia and Darakeene. Most ideal places to start adventures. Maybe it has to do with Campaing book, and french publishing, dunno. But IMO that was a mistake.
Books for Asaathi and Slithering weren't that interesting.
Bloodsea was kind of plah.
Hornsaw Forest was uninteresting and lamer than it's reputation.
Any of these could have been replaced with Vesh or Albadia for starters.
Calastia book was partially as boring as my history book. Why nothing detailed about Galeeda's Grove even?
Penumbral Pentagon was a bad book. And also made mistake of not giving people stuff they wanted. Drendarian Shadow walkers and stuff like for starters.
And wasn't "players book to slarecians" something we did NOT want. Ruins were the cool part, return of slarecians should have been something left for dm:s. As the truth what slarecians were. So instead of usable multible maybe:s they told us "the Truth".
So, at this point I gave up, and thought, oh well, now they really have forgotten.
My Scarn had far gone from "official" campaing but I continued buying the books. For interesting bits and pieces (as do those that only use books for some another campaing world), and out of curiosity what they "break" next.
So this is why I buy and whine.