Keep Talking and Nobody Explodes. It comes with a laughable 11 modules which you tire of after a couple weeks of playing. It's badly coded and its modding support is flimsy and haphazard. The developers are unreachable and uncooperative.

Without mods, you'd put down the game after a week and forget about it completely. With mods (created for free by the community) you now get a wealth of thousands of modules, but you also need multiple extra mods to get simple basic functionality that should be in the base game. Wanna play more than 100 modules? Game crashes on startup unless you install the Tweaks mod. Wanna play just the modules that your friends enjoy? Gotta mess around with Steam workshop subscriptions for hours unless you install the Mod Selector mod. Wanna play a specific set of modules you like? Good luck getting the right RNG, unless you install the DMG mod. Wanna play more than one bomb? Needs the Multiple Bombs mod. Some modules are genuinely unplayable unless you get the Boss Module Manager mod, which in turn relies on a volunteer-run external website to be running and to be constantly updated by volunteers. Even Camera Zoom is a separate mod!!

99% of the game is made for free by volunteers, and yet it's the garbage 1% that everyone has to pay for. It's a travesty.