I’m going to keep this one pretty short, because, beyond a general set of conditions, I don’t know exactly how to answer this.
The perfect game for me is one that emphasizes speed of action over complexity, and character and story over number-crunching simulation. That’s pretty much ideal for me. If you can also throw in some random-generation systems (on the player AND gamemaster side) to spark ideas, then that starts moving it into “perfect” territory, for me.
Here’s Dave Chapman’s video entry for the day, with special guest, Norwegian RPG designer and journalist Ole Peder Giæver: