This game is awesome if you can play online.  The normal game is pretty boring.  Custom games is where this game really shines.  The WC3 map editor allows you to do pretty much anything that you could ever want to do with this game.  It is basically a really easy way to mod the game.  DotA and the hundreds of custom RPGs made for this game are incredibly fun to play and you never run out of new ones because so many people make new maps because the map editor is so easy to use.