Destiny.
Don't get me wrong, the game itself was actually pretty fun while it lasted.
Except for the non-existent storyline, bullet-sponge bosses and painfully grindy loot system.
Bungie took forever to get basic updates out and Activision literally butchered the game with DLCs and expansions.
At first I considered buying the expansions but the moment the first DLC came out I instantly backed out of that idea.
They literally replaced all the buyable legendary weapons with new ones that had better stats. So basically your old legendary weapons from the vanilla game you worked so hard to buy and level were pretty much useless if you wanted to do the new raid. Keep in mind, you couldn't (at the time) upgrade your old legendaries to be as good as the new ones so you were pretty much forced into grinding for new ones with better stats.
Later I decided to give the game another go but when I did, the second DLC came out and implemented a system where you could actually upgrade your vanilla weapons to be as good as the new ones. At this point I was pretty much done for that feature was so goddamn basic it should have been apart of the vanilla game on the day of its release. Now I had just wasted hours of my time grinding for new legendaries and leveling them up.
When all the expansions finally came out I felt like I had been cheated out of 60 bucks on half a game with the other halve(s) being resold at 20-40 bucks apiece.