iOS Games are generally hard to rate. Some might have good graphics, but they might not attract you to pick up your device again and again to play them. On the other hand some of the games are so addictive that shoddy graphics, etc do not matter and you keep playing them for ours.
Here's an easier way to rate iOS Games. It's called the Addictivity Meter. Games below have been marked on the basis of their addictivity and have subsequently been given points:
I would love to have your feedback and suggestions on this.