I honestly have more 5E books than I really should, but I try to buy things when I visit my FLGS just to keep them alive (and to encourage stocking things I like). I don't tend to keep regret purchases, but I'll see what I can remember.
Wizards of the Coast: Every official hardcover printed through November 2022, with the exception of the Tyranny of Dragons reprint (because it was redundant) and Monsters of the Multiverse (because it was redundant). With one exception (Acquisitions Inc) I loyally bought every hardcover on release, up until Ravenloft, after which I became much more cautious. Almost didn't buy Spelljammer. Waiting on reviews for Dragonlance. Of official boxed sets, I have the original Starter Set, Essentials Kit, and the new Starter Set. Did not purchase the Stranger Things set (though I considered it) or the Rick and Morty set.
I've only read a little over a dozen of the above so far, and have yet to read any I would actually regret (though I expect to feel that way after some of the more recent ones). Theros was probably the most disappointing that I read, but it wasn't bad. My favorites of non-core books so far would be Volo's (yes, despite warts), Xanathar's, Mordenkainen's Tome of Foes (though less enthusiastically than Volo's), and Ghosts of Saltmarsh.
DM Guild POD: Elemental Evil Player's Companion (liked), Monster Manual Expanded I and II (original versions, not read yet).
Goodman Games: Read assorted Fifth Edition Fantasy modules, didn't dislike any but did give several away. Still have a few unread. (Favorite is actually one I don't own in print, Glitterdoom; my brother ran that for us.) Also own OAR 1-6 (Into the Borderlands through Temple of Elemental Evil), haven't read yet.
Kobold Press: Tome of Beasts (liked), Creature Codex, Tome of Beasts II, Midgard Heroes Handbook, Deep Magic, Vault of Magic, Tome of Heroes (rest all unread). Had the two Warlock compilations but gave them away.
EN Publishing: Level Up core rulebooks, Mythological Figures & Maleficent Monsters. Haven't read yet. Also owned A Touch of Class and the later hardcover compilation, which were largely disappointing and I gave away. (Still have the PDFs, though.)
DMDave: BroadSword #3, BroadSword Monstrous Compendium. Haven't read yet. Did read BroadSword #1 and #2, not bad, but gave away. (Still have the PDFs.)
Quillion: Rolled & Told Volumes 1 and 2. Haven't read the hardcover versions yet, but did read some of the individual issues, which were fine.
MCDM: Kingdoms & Warfare, just arrived, unread. Awaiting Flee, Mortals! Had Strongholds & Followers, was a bit disappointed (too much off-topic filler) but didn't hate, kept PDF and gave away hardcover.
Green Ronin: Tal'dorei Campaign Setting, not yet read. There have been others I considered, but due to previous behavior by their leadership, I no longer buy products from Green Ronin.
Darrington Press: Tal'dorei Campaign Setting Reborn. Not yet read (and won't happen until after I read the previous).
Onyx Path: Scarred Lands Creature Collection. Not yet read.
Troll Lord Games: Monsters & Treasure of Airhde. Not yet read.
Jetpack 7: Gods and Goddesses Redux. Not yet read. Did read Legendary Dragons, was a bit disappointed (too much filler), but didn't hate, kept PDF and gave away hardcover.
Cubicle 7: Some, but not all, of the Adventures in Middle-Earth line, none read yet. Planning to buy Doctors and Daleks when it's released in print.
Edge Studio: Adventures in Rokugan. Not yet read.
Wyvern Gaming: Stargate SG-1 RPG. Not yet read.
I've only read a little over a dozen of the above so far, and have yet to read any I would actually regret (though I expect to feel that way after some of the more recent ones). Theros was probably the most disappointing that I read, but it wasn't bad. My favorites of non-core books so far would be Volo's (yes, despite warts), Xanathar's, Mordenkainen's Tome of Foes (though less enthusiastically than Volo's), and Ghosts of Saltmarsh.
DM Guild POD: Elemental Evil Player's Companion (liked), Monster Manual Expanded I and II (original versions, not read yet).
Goodman Games: Read assorted Fifth Edition Fantasy modules, didn't dislike any but did give several away. Still have a few unread. (Favorite is actually one I don't own in print, Glitterdoom; my brother ran that for us.) Also own OAR 1-6 (Into the Borderlands through Temple of Elemental Evil), haven't read yet.
Kobold Press: Tome of Beasts (liked), Creature Codex, Tome of Beasts II, Midgard Heroes Handbook, Deep Magic, Vault of Magic, Tome of Heroes (rest all unread). Had the two Warlock compilations but gave them away.
EN Publishing: Level Up core rulebooks, Mythological Figures & Maleficent Monsters. Haven't read yet. Also owned A Touch of Class and the later hardcover compilation, which were largely disappointing and I gave away. (Still have the PDFs, though.)
DMDave: BroadSword #3, BroadSword Monstrous Compendium. Haven't read yet. Did read BroadSword #1 and #2, not bad, but gave away. (Still have the PDFs.)
Quillion: Rolled & Told Volumes 1 and 2. Haven't read the hardcover versions yet, but did read some of the individual issues, which were fine.
MCDM: Kingdoms & Warfare, just arrived, unread. Awaiting Flee, Mortals! Had Strongholds & Followers, was a bit disappointed (too much off-topic filler) but didn't hate, kept PDF and gave away hardcover.
Green Ronin: Tal'dorei Campaign Setting, not yet read. There have been others I considered, but due to previous behavior by their leadership, I no longer buy products from Green Ronin.
Darrington Press: Tal'dorei Campaign Setting Reborn. Not yet read (and won't happen until after I read the previous).
Onyx Path: Scarred Lands Creature Collection. Not yet read.
Troll Lord Games: Monsters & Treasure of Airhde. Not yet read.
Jetpack 7: Gods and Goddesses Redux. Not yet read. Did read Legendary Dragons, was a bit disappointed (too much filler), but didn't hate, kept PDF and gave away hardcover.
Cubicle 7: Some, but not all, of the Adventures in Middle-Earth line, none read yet. Planning to buy Doctors and Daleks when it's released in print.
Edge Studio: Adventures in Rokugan. Not yet read.
Wyvern Gaming: Stargate SG-1 RPG. Not yet read.
Legendary Games: Bought a handful of their products in print, was disappointed by enough of their material I don't buy them anymore. Gave away my print copies.
AAW Games: Had Underworld Races & Classes for a while, but eventually decided I wasn't interested enough, and gave it away.
Media Lab Books: Had The Game Master's Book of Random Encounters, lost interest and gave it away. Picked up The Game Master's Book of Legendary Dragons, only to learn it was a duplicate of Legendary Dragons with a different cover, so it also went on the giveaway pile...
AAW Games: Had Underworld Races & Classes for a while, but eventually decided I wasn't interested enough, and gave it away.
Media Lab Books: Had The Game Master's Book of Random Encounters, lost interest and gave it away. Picked up The Game Master's Book of Legendary Dragons, only to learn it was a duplicate of Legendary Dragons with a different cover, so it also went on the giveaway pile...
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