The first and only game I ever bought a season pass for was Borderlands 2. I loved the game so much that I just knew the DLC had to be as good. So, I plunked down $20 (chump change now when you compare to season passes for games like Batman: Arkham Knight and Call of Duty: Black Ops III) and I was fucking pissed when I saw the garbage they gave us. Not only was it outsourced to another studio (except the Tiny Tina DLC), but all the campaigns could be beat within a couple of hours. The only reason I wasn't completely irate was the Mr. Torgue campaign, just because Mr. Torgue is the best character ever.
A textbook example of DLC done wrong is the Forza Motorsport series. Forza 4 had something like 400 cars, right from day one. When the Xbox One debuted and Forza 5 debuted, it had something like 200 cars and you had to buy the rest as DLC. That's shitty. You get half the game, but still get charged the full-game price.
Speaking of things developers and studios are starting to do that really brings my piss to a boil is store-specific day one rewards. I know for Batman: Arkham Knight, if you bought the game from Gamestop or Wal-mart, you got the Harley Quinn missions. If you bought from Target, you got the Red Hood story missions. I'm also thinking the Scarecrow missions were specific to a certain store. And these missions were available after a certain time window for all users (something like six months). Don't release the game and withhold missions from me because I happened to buy a game from Wal-Mart instead of Target!