That's what I'm doing and it works very well. As a media device, it's the best option I've found. Built-in wireless, fast CPU, lots of RAM, supports Netflix, Amazon Instant, Hulu, XBMC, Pandora, and more. Roku has more channels available, but doesn't have any options for streaming content over a LAN.
I played a few minutes of Minion Rush on the Amazon Fire TV. It had some laggy moments, certainly not the gaming experience that they claimed it would be.