A must have game!
Gameplay, like most RTS games, you have to build up your base and destroy enemy units. But in some custom made maps, it really starts to work as a RPG game.
Sound, nothing much about it, it's all normal. Voice acting here is kinda cool though, the soundtrack are mediocre.
Graphics, for a 2003 game, it's considered as well done.
What really pulls us to this highly addictive game is their custom maps. There's a custom map called DotA or Defence of the Ancient where you pick a specific hero and terminate other heroes and destroy their main structure(Sentinel - Tree / Scourge - Throne).
All in all, this game can last us forever because of their custom maps.
If I were you, I'd most probably buy this game than rent it.
My rating for it - 9.1/10.