Well, I'll be honest with you;
The community is rather small, I would say...maybe 1000 people playing Demigod at least 1 hour per weak?
There are times when there are about 150 people max, playing Demigod at the same time. (Call this a rush-hour)
But usually you wont find more than 50-70 people online at the same time. The game is very addictive, the community is very competitive, unforgiving and cruel sometimes, however, our small community has some pros;
One is that usually you wont see any 10-year-olds who whine and cry like insane,
And another is that many many people are helpful to whatever problem you may be having (connection issues, computer problem, questions about the game, etc)
My suggestion to you is to start playing in Noob games, (if you cant join one, just host game with Noobs in the title), and when you reach a decent level of skill and experience, you can play almost every game available (yes even pro games).