Problem 1: If you stream anything over the air like games or movies you are subject to network latency. WiFi is just not as fast as a wired network. You get stuttering and pixelation at times.
Problem 2: You want Ethernet in a room but getting the wire there can be a huge ordeal. Many times you do have coax cable there already.
Solution: MOCA Networking.http://www.mocainyourhouse.com/http://www.mocalliance.org/index.htm
My friend at work told me about this after I mentioned that I wanted to put ethernet where we watch TV but it was going to be a huge ordeal running the wires. He said do you have a coax cable in the room? I said yes and he said you can use MOCA networking. He explained how it works.
Basically MOCA allows TCP/IP to run in an empty section of the bandwidth in a coax cable. Its a standard among the cable companies. Why its not advertised more is beyond me because its much faster than WiFi and as fast as ethernet.
The installation consists of buying a Moca adapter. Moca adapters have an Ethernet port in them. Verizon routers already have Moca built in and enabled so I only need to buy the Moca adapter in the room where I want the Ethernet. If your router does not have it built in you need to buy one that attached to the router and one for the end point. This is the Moca adapter I bought from Amazon:https://www.amazon.com/Actiontec-Ethernet-Adapter-Service-ECB2500C/dp/B008C1JC4O/ref=sr_1_2?s=electronics&ie=UTF8&qid=1487595039&sr=1-2&keywords=moca+adapter
After you have the Moca adapter - you split the coax cable with a splitter. The Moca adapter has a built in splitter but per my reading its better to split the cable - one side goes to your cable box or TV and one side goes to the Moca box. Plug in the power cube and you have instant Ethernet network. The Moca adapter has an Ethernet port in it - you can connect a Roku, Ethernet switch, whatever... now that you have an Ethernet port in the room.
I only bought one Moca adapter to try it out. Attached to the coax in our bedroom and it was totally painless. I did some speed tests on it and compared it the wired Ethernet in my home office. Its FAST, really FAST. As fast as Ethernet.
For the $72 for the adapter it solves a bunch of problems and is worth it. Here are my speed tests: