Probably an NES or Genesis game that barely made its way past QA.
Most recently Dragon Age Origins on PC. The amount of micromanaging I needed to do for some battles was insane. I might've been doing things in a weird order, making it harder on myself. I opened up my laptop one day and thought whether I should keep going in Dragon Age or check out Oblivion. I made one of the best decisions in my gaming life that day.