If Netflix is your primary source of TV and movies, why wouldn't you just buy a Netflix-enabled bluray player for $40 or $50 more than Apple TV? Then you can use Netflix for mailed DVDs/blurays and streaming to your bluray player. And you're covered for the 25 DVDs you own and Blockbuster that you use occasionally.
Because I want to be able to rent new releases instantly. Blockbuster near me is shutting down making it difficult to get new releases.