Overall, I still prefer using a computer hooked to a TV. That way no corporation can tell me what I can and can't watch or listen to on my TV and how/when I do it as well.
Warning: This is an applecentric approach... if you hate Macs don't read this...
One can pick up used Intel Mac Minis very cheap from craigslist. It may cost more, but I figure it's worth it because of the freedom to watch whatever I want to, the reduced hassle in time trying to make other devices work, remoting into it how I want to, and they tend to last forever as well.
I can remote into a Mac Mini from a smart phone or laptop from anywhere and have it start downloading an HD movie or whatever to its own hard drive to be ready to play by the time I'm home (and/or start playing what's downloaded so far while the rest downloads) and in high HD quality to boot.
That said, the Chromecast seems very limited in what it'll play and I'm not sure even jailbreaking it will solve that issue because of the nature in how it works. Seems that hacks to play local files off computers results in pretty low quality video (so far) that even a jailbroken, etc. Apple TV will surpass:
If the Chromecast had a hard drive (or the ability to plug one into it) and let me store video (any format, not some proprietary bullshit only) to play from there, then I'd be pretty excited about it. Or, if it let me stream anything from my Mac (with quality results) without restriction (like a jailbroken Apple TV) then I'd be much more interested as well.
Otherwise, this Chromecast just seems like a quick way to stream YouTube videos, the limited library of Netflix and not much more to me. Even down the road when it "allows" one to stream from Pandora or whatever, I'd still prefer to use my local iTunes library, etc.
Also, it's really none of the NSA's business what I'm watching and listening to, Google.