Unfortunately, when it comes to satellite internet, many games will be unplayable due to the high latency (ping) mentioned by infinitytec, regardless of the connection method. It won't really matter whether it's connected directly to the HT2000W via Ethernet cable or connected via WiFi. It's one of the drawbacks of satellite internet.
Turn based games are usually okay, but real time games, like action games, generally don't work well, if at all.
From the FAQ page...
The total round trip is actually about 90,000 miles. One leg is about 22,300 miles, and there are four legs. From your dish to the satellite, then back down to earth at the gateway, which is where your service actually "enters" the net, then back up to the satellite and back down to the dish at your home.
As for the Nighthawk router splitting the speed, keep in mind that the total speed you're getting from the service will be split between devices that are actively using the net at the same time, though not necessarily evenly. So, if you're getting 25Mbps, and you have two devices actively downloading from the net, that 25Mbps will be divided between those two devices, though, again, not necessarily evenly, as one device may be doing something that doesn't require much speed, while the other might be using all the speed it can get. It would be the same with three, or four, or more devices actively using the net. The available speed would be shared and divided between them.
