its custom map of sc2 . This is blizzard we are talking about , how can you imagine that they suck this much in a game ? If blizz would make the blizzard dota , it would rock the world and make ppls to uninstall HoN , LoL , wc3 , avalon heroes and all 
yeah but Blizzard doesnt have one important thing......Icefrog
even LOL and HON got main creator that worked on Dota (Eul, Guinsoo) so all 3 know what dota is, Blizzard dont know coding of dota, principles etc thats why everything else then dota sux pretty hard as those LOL and HoN even they got previous dota coders