2) grab a remote is better than grab a laptop and fire an application, plus you need to power it on, etc. but if you prefer that it's ok. Netflix and pandora apps are available in Android, no need to use a web browser.
3) " but based on all the reviews, it's capable of playing 1080p video no sweat" well, is not what the review says:
"If you’re using the Chromecast extension for Chrome on your laptop to project an otherwise incompatible video site (like Hulu or HBOGO), however, video quality can dump quite a bit depending on your setup. It’s using your laptop as a middle man to encode the video signal and broadcast it to the Chromecast, whereas the aforementioned compatible sites just send video straight to the dongle, mostly removing your laptop from the mix. When casting video tabs on a 2012 MacBook Air running on an 802.11n network, the framerate was noticeably lower and there were occasional audio syncing issues."
You even need an additional transcoder! the mini pcs can decode MKVs by themselves (and lots of formats more)
4) network resources, yes they can: https://play.google.com/store/apps/details?id=ws.plattner.ci...
Look, I got an apple TV and one of those "dongles" connected to my TV, and trust me, when I need to play an MKV is way more easier to use a remote to access the File NAS than firing up Beamer app (http://beamer-app.com/) from my mac to watch a movie.
Chromecast requires extra hardware to complete almost anything, so yes, I think it's less capable than the mini pcs at 36 usd that ship free.