If you've discounted iOS devices as "true" gaming platforms, it's time to wake up.
The platform is still in its infancy, but as developers learn to utilize the touch interface, they produce some amazing work. Now, you're not going to find an RPG with the scope and style of Skyrim, or an MMO on the same technical level as World of Warcraft, but that's not really what the platform is for anyway. What most mobile games lack in sheer breadth and polish, they make up for in creativity and simple fun.
You know what else? You can purchase every single game on this list - games that will, combined, easily last dozens or hundreds of hours - for less than the price of one full-priced console game.
Let's get started.