It's really hard to find a great online war game. There are thousands of options and there's no way to test them all. So, how do we make sure the games we find are good?
If you type something like "war games online" into Google, you will get lots of results just to find something that interests you. Try looking for games that other people recommend. There are many communities and magazines that write about new online games such as gamespot.com, walking dead toys, PC gamers, Gamepro, and others.
If you have a pretty good idea of what you're looking for, is it easier to find, do you enjoy shooting head-on, or are you more strategic? The more specific you are, the easier it will be to find something you might like.
It doesn't matter if you are interested in the community behind online war games or if you are more of a standalone player. The bigger and more active the community, the better the game.
It's also safer because there aren't many people playing, which means the game will likely receive less support, updates, and eventually get shut down.
It should be easy to play, to have advanced features which you will learn in time. However, if it's too hard to learn the basics, you may not be the only one. and that means fewer users, you won't have much fun.
Make sure the online war games are fully functional. There are many games that charge per game monthly or free.