Chromecast is $35, so this is not a logical choice if all you want is a streaming media adapter. While you're right that the gaming forums have been abuzz about this ad, most of the people on those forums are hyper aware of Ouya and every other niche device or console that is released. As such, this isn't a very effective ad, especially if those same people are offended.
Moreover, the message in the ad doesn't even make sense. This isn't some alternative to regular consoles or AAA games, it's a device that is designed to play smartphone and tablet style games on your TV. I doubt that gamers who are bored of the FPS sequels that come out like clockwork have been dreaming of a way to play smartphone and tablet style games on their TV. I suspect many of them, including myself, simply buy niche games on PS3 or Xbox 360 or PC or use XBL Arcade, Steam and PSN to fill the need for more obscure games. As such, I still have no idea who the Ouya is really targeted at as everyone I know who bought one just did it because it was cheap, messed around with it for a few hours and hasn't been back. Heck, Ouya's own data supports this as something like 73% of buyers haven't even purchased a single thing and only 8% of the people who download a free demo of a game end up buying it. That's pretty poor considering how cheap most of the games are to begin with.