Khaun said:
lol Left 2 Die..., Valve probly are trade marking DotA as thier probly taking on the Devs and felt it a good idea to take on a well known title name. Its also a genre they've never touched (RTS) its kinda nice Blizzard doing a 'spoof' of Left 4 Dead wouldnt call it an attack or a telling off, but if thats what is intended rather childish.
Left 2 Die is a RTS map not shooter, it is the starcraft 2 Mission Outbreak co-op mode. The maker of that map said he is a big fan of Left 4 dead that is why he name his map after it. If you didn't notice all other maps are reference to some form of media.
Blizzard DotA -> DotA
Left 2 Die -> Left 4 Dead
Aiur Chief -> Iron Chief (TV show)
Starjewelled -> Bejewelled
Blizzard love to pay tribute to other game or movies.
Just a list of easter eggs in Starcraft 2.
http://starcraft.incgamers.com/wiki/Easter_Eggs#StarCraft_II_Easter_Eggs
From Lilo & Stitch reference to Duke Nukem reference, there are pretty much everything.