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.

What makes Valve games unpopular on Steam? - Quora

Dota 2 will be free to play - GameSpot

Are there any new, good games coming out soon? - Quora

Video Games With Esports Potential

Getting Started in Dota 2

Valve's Free To Play documentary gets a release date - GameSpot

Free To Play, Valve's Dota Documentary, Is Out And Free

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

Dota 2 18th March Patch – Content Analysis - GameSpot

Valve launches first mobile game

Free to Play on Steam

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

Free to Play on Steam