I think if you play a lot of big mobile games with 3D graphics, and a lot of levels, having a 64GB or larger MicroSD card is a good idea for gaming on Android on a smartphone or tablet.
But, if you just play a few smaller games like Angry Birds, the internal storage space on a Android smartphone or tablet is enough space for storing games.
I agree. I think for large mobile games, a MicroSD card would be a good idea. For smaller games, It'd probably be good just using internal storage. I have a 32GB MicroSD card in my tablet and phone, and don't have to worry too much about space.
Yes, you are right. Having over 64GB of memory is a must if you're into mobile gaming. Even regular apps, such as Facebook, Twitter, Kik and Skype, take a lot of space. If you want to use the basic apps and still have room for games, you need a lot of storage.