[quote name='LaraCroftsLeftBoob']iirc, you can get the android marketplace on the kindle fire, but you have to root it.[/QUOTE]
You don't even need to root it; you can load games/apps if you can mange to get the .apk file onto the device. I download games on my S3, back up the .apk to my desktop and then put them on the Kindle.
The biggest downside is many of the popular games (gameloft, ea, etc.) have unique "Kindle Edition" versions that must be purchased via the Amazon storefront. Half the time, the Play Store versions won't work correctly on the Kindle.