A game that was so far ahead of its time that others are still trying to catch up. Beautiful graphics that still surpass any other MOBA out. Nice sound track and great sound effects. With a surround system the battles pound.(When Rook starts swinging his hammer, you feel it.) Not to mention, Christopher Lee as the narrator!
There is a small (and seemingly growing} group of players on this one. Join the community forums to find players that really enjoy it. Also there is a mod pack that absolutely crucial for this game, again see the steam community forums for details of where to get it.
I have had this one for a while and I love that it came out in 2009 and I am still having so much fun with it. With the mod pack(which fixes some AI issues) the game provides an amazing single player experience and with a full roster in multiplayer the game owns. Inspite of Dota's massively superior numbers and the full weight of Valve's marketing, Demigod eats Dota's lunch.
Be advised though, you should consider this as a "Single Player" purchase. Do that and you will enjoy the ride.