Dota2 being a Valve-product feels very strange. Valves previous titles are all extremely good at teaching new players the game. Dota2 is terrible from the very beginning where they ask you to chose between 3 different keyboard/mouse configurations (how am I supposed to know that before I even played it???).
Valve have done surprisingly little to make Dota2 more approachable. The dark green/brownish graphics might be high-res, but they really suck at communicating whats going on which in my opinion is an essential quality for graphics in a competitive PvP-game (and as spectator for esports).
It will be interesting to see how big Dota2 is going to be. Being backed by Valve is obviously huge.
Edit: On League vs Dota, this is essential
You guys briefly touch onto this in the podcast and imo this focus on counterplay is certainly defining League.