A:AnswerI have had no trouble at all casting YouTube or Netflix to my GoogleCast enabled TV, I assume it would work just as well with a Chromecast plugged into a TV. I usually cast YouTube from a Chrome tab and Netflix from the Android app. Both work just as expected.
A:AnswerWell it depends on what kind of games. If your talking about android apps and games or online games. It is perfect. Again you can't download steam games
A:AnswerLooks like they had some early (2012) issues, but I'm not sure now. Might borrow someone's Chromebook and see if it works before purchasing one.
A:AnswerGoogle maintains the current Flash player in the browser. The primary website my kids need is a Flash based site and it works flawlessly. Google has done a great job here and it is so much better than the process I had to go through to up date the regular PCs we used before. YMMV but I think Google does a great job with the Chromebook books and Flash.