4) Mechs
Kind of a subjective one, I guess, but have you ever played a good mech game? I mean, like, an actual really good one? Don’t lie to me. You haven’t. MechWarrior was just kind of slow and dismal, ChromeHounds even more so (and in fact the only game I’ve ever returned to the shop because it was so mind-bendingly atrocious) and the less said about Steel Battalion: Heavy Armor the better. It’s a pretty turgid history, all considered.
The concept of a mech is quite superb, however, and it’s miraculous that people consistently make such a hash of it. They’re even frequently draughted into various other franchises too, in the hopes of making a them cooler. Long running tropes such as Gears of War, Metal Gear Solid and Lost Planet, to name a few, have all inserted a swaggering, metal killbot, but all with the end result of making them exactly 0% more fun.