Batman: Arkham Knight.
Or rather, the hilariously overblown system requirements and utterly abysmal performance resulting almost singularly from developers not having the time, caring, or knowing how to optimize for PC, even on systems vastly more expensive and powerful than a console.
I'd also like to specifically point out pre-order DLC for games on Steam. Even though it's a problem for the industry overall, it makes even less sense when your primary method for acquiring the game is through a digital download, because the product is never going to run out (hilarity of Steam code fuck-ups aside), so why should you pre-order it?
Kind of a strength and weakness in one, if you try to play older games then it's kind of a toss-up as to whether they'll work on your system or not, even if you buy from GOG, but there are usually places on the internet you can look to find out how to tweak it to get it working.
Oh, and how about Steam in general? And the way it led the way for Origin and, to a lesser extent, uPlay? And Battle.net? And that Square Enix account thing? And the Rockstar Social Club? And the now-thankfully-defunct Games For Windows Live? I'm really tired of constantly needing to set up new accounts for things in order to play a single game, just so that a year+ down the road when I try to play the game a second time or whatever, it'll ask me to log in and I'll have forgotten the specific account details I used for that particular piece of bloatware.
Also, DRM. SecuROM, online checks, Starforce, TAGES, the recent Denuvo, the aforementioned storefronts, etc. etc. etc., all a whole load of bloat in itself that can actually tangibly impact the performance or stability of a game. So, you know, that's great. I know DRM isn't specific to PC gaming either, but that's certainly where it seems to be the worst and most intrusive. It's like the music industry back in the early '00s.