Technically Far Cry: Blood Dragon was a standalone expansion rather than DLC for 3, but it blew every other far cry game out of the water.
Project Hel, a DLC for Ghostrunner. The base game was already pretty great, but the DLC added jump trajectories, making movement less ambiguous and improved the frankly wonky upgrade system of the original. It also added a new (albeit shorter) story, a new rage mechanic and you get to play as a cold, unfeeling cybernetic abomination controlled by the villain of the base game.
All of this is to say that I was floored on how much I preferred playing the DLC than the original and I loved Ghostrunner.
Fallout 3 and NV.
Rimworld
Pretty cliche, but The Witcher 3.
Both of them are excellent, blood and wine especially as it really nicely ends Geralt’s story. Also Tuson (sp?) is just beautiful.
Toussaint. They weren’t being subtle about the frenchness
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Mass Effect trilogy had some pretty good DLC. Citadel is probably in my top 3 DLC of any game of all time.
Factorio.
Enemy Within for XCOM Enemy Unkown was a perfect addon. New storyline, new surprises and more polish to the main game. Well worth the money
No personal experience but Euro Truck Simulator seems to be doing it well
Tiny Tina’s Assault on Dragon Keep as part of Borderlands 2 was so fun at the time - all of the BL2 DLC was good honestly. Haven’t played it in years though.
Hyrule Warriors Legends and Mario Kart 8 had DLC that doubled the content and didn’t cost that much. I probably played more DLC then the main game for both.
Rimworld or Crusader Kings. Their DLC expands the possibilities of what can happen during a game and are entirely optional. Their existence doesn’t take anything from new players who only own the base game and you can pick and choose what you want to add to your game to expand it how you so choose.
I second Rimworld. The DLCs literally only add content, and are completely optional even if you own them. In fact, let me shill Rimworld for a second…
Never have I felt every emotion possible from playing a game. From sorrow about one of my child colonists getting gunned down trying to move a rock, to triumph watching a lone colonist single-handedly repelling a mech threat with a bolt action and a sandbag. Rage, watching one of those bastards breakdown from having to sit in a shitty chair and murdering the only doctor in the colony, then dying to the wounds sustained from said doctor shortly after.
Ate without table / 10
Disturbed Sleep x3 / 10
58 manhunting crows / 10
Muffalo Revenge / 10
We butchered humanlike / 10
Red Dead Redemption’s Undead Nightmare was excellent.
I quite like most of the The Binding of Isaac DLC (although sometimes they’re a bit too big, to be honest).
The Vietnam DLC for Battlefield: Bad Company 2 was also rather good. I didn’t get to play as much of it as I might have liked but I remember it being more than just a resin.
Bonus: Red Alert 2: Yuri’s Revenge (an expansion pack rather than DLC admittedly)
Bioshock Infinite Burial at sea episodes 1 and 2 are the only DLC I ever bought. They close a wonderful history.
Fallout is pretty good. I appreciate that they have DLC directly from Bethesda, as well as the openly approved mods and the ability and openess to allow bigger mods that expand the game. There’s a lot of reasonable hate for Bethesda and their timeframe, but they’re pretty good on allowing mods that are essentially amateur DLC. I just wish we had an update to really make the series new.