Valve's Free to Play Dota 2 documentary available now - GameSpot

After being in production for a number of years, Valve's "Free to Play" Dota 2 documentary is now available on Steam, and iTunes.
Dota 2 features the characters and factions from the original Defense of the Ancients title with new features.

Getting Started in Dota 2

Valve's Dota 2 Documentary Free To Play is Coming To Netflix

Valve's Free to Play Dota 2 documentary available now - GameSpot

Valve Documentary 'Free to Play' Release Date Announced - VGU

Dota 2 - Wikipedia

Valve's Dota 2 Free to Play Documentary Available To View March 19th 2014

Free to Play on Steam

Valve's Free to Play Dota 2 documentary available now - GameSpot

I think this (summary) review of Dota 2 pretty much sums it up : r/DotA2

Dota 2 - Wikipedia

Million-Dollar Men: Top 10 S'porean Esports Players - Vulcan Post