Real time online gaming does not work well with HughesNet, if it works at all. Very often the game won't even start due to the system determining that the latency is too high to bother. The distance of signal travel alone, which is over 90,000 miles, accounts for most of it, with the latency normally sitting in the 600ms - 700ms range. Unfortunately, there is no way to improve it.
Turn based games, on the other hand, usually aren't affected.