For starters, the tab casting from Chrome browsers is prominently labeled BETA, as in there are going to be bugs and things needing polishing. When the demoed casting from devices, they only showed APPS like YouTube, Netflix and Google Play. Other apps will build in casting abilities - notably HBO GO and Hulu+. App devs are already scrambling to get their apps working with 4.3 and the Chromecast has been out two freaking weeks, so to claim that you were deceived because you imagined it would just automagically mirror your phone to your TV is silly. Put it on Craig's List - people who understand what it is will take it off your hands.
I really don't understand the sense of entitlement people have when something doesn't do what it was never promised to do. When the Kindle Fire was announced, they clearly said what it was, but when it actually arrived, people filled their diapers over how it didn't so something or lacked a feature. "The Fire sucks! It doesn't have camera or GPS or a plate which will keep my coffee warm and my beer cold! I was lied to!!!" Uh, where did you get the idea that any of those features were going to be in there? "Amazon sucks! This product is gimped!!!"