Stuff looks fuzzy on my new 4k HDR TV. What's wrong?

I bought this new TV, it's an upgrade to my 720p T.V.

Things look fuzzy on it, like I can't view them at their full graphics potential. For instance Netflix is streaming in 480p instead of 1080p even though I told it to use high graphics, and games on my Xbox that say they are 1080p graphics look shitty. Everything is looking worse than my 720p television. Yes stuff is hooked up to an HDMI cable.

What could be going on? It's a Vizio M series.

Submitted by Autumn-Moon | #Specialdealer Special Offer Online Shopping Store 2016