I have been wanting this forever. In today's Steam update it finally came. You can disable DLC you don't want to use, such as bullshit bonus items that ruin game balance.

Bioshock Infinite is one of the worst, giving you like 5 extra health/shield/mana things at the start if you bought the season pass, and you can't even move on in the game until you use them. So infuriating! And Deus Ex Human Revolution's way overpowered silenced sniper rifle, complete with immersion breaking "thanks for pre-ordering" UI popup! All gone! Bye bye!

So lovely.

Good news indeed. Thanks for sharing the joy)

Never did see the point of that. If I spent months or years working on a game, tweaking gameplay, adjusting the difficulty curve, the last thing I'd want to do is throw it all out the window in favor of crap that breaks the game right off the bat.
Like Fallout New Vegas, buy the GOTY version and end up with all four of the extras packs, so much crap that you can barely move. Completely ridiculous.

This x 10^23

Good. I wonder how does it work - does it redownload the game without the content, or does it just prevent the game from using it somehow?

That's great news. No more cheat DLC that you can't turn off.

I tried it out on Bioshock and Deus Ex. For Bioshock it downloaded for a second, then finished. For Deux Ex it didn't seem to do anything. Hopefully it worked for both, I'll have to try it out at some point.

Indeed, I always start Fallout New Vegas by walking over to the nearest mailbox or convenient container and dumping everything that I got "for free" with the included DLCs.

It makes for a way better experience - and play in hardcore mode, of course. That makes Fallout New Vegas one of the best computer RPGs I have ever played (along with Fallout 1 and especially Fallout 2 of course)

Good update.
With some Sleeping Dogs DLC you gained about 8 levels, gained a ton of money and some fancy overpowered stuff at the start of the game.
It is nice to disable them by option than by going into game folder and deleting the right fiel as was necessary unti now.

Avogadro approves.

This is, indeed, a good thing. Wonder why it took so long for them to get this implemented.

This has been in the beta for a few weeks.

This also helps with games that have soundtracks that are stored with the game itself. I'm looking at you, stupid Payday OST.

Alternatively you can simply disable the 4 Courier's Stash DLCs when starting the game (in the launcher or Mod Manager, whichever you use), that way those items won't even appear in-game in the first place. In the case of FNV at least, this new Steam feature doesn't really offer something new, but I can see that it will come in handy for other games.

That's the one.
When StingeyVelvet mentioned Bioshock Infinity as the worst, Sleeping Dogs immediately sprang to mind.
Saints Row 3 also had a couple of bad ones I think.

A very good suggestion, I never thought about simply disabling the DLC in question, my brain just always assumed that it was part of a DLC, not a DLC by itself.

Indeed this Steam feature offers Fallout New Vegas users absolutely nothing new. But probably nice in games where DLC management is not available.