There have certainly attempts to apply statistics and machine learning towards drafting teams in Dota 2. [1]

Alan "Nahaz" Bester does a lot of statistical analysis of Dota 2 games. [2]

**Sources and References**:

 [1] Conley, Kevin, and Daniel Perry. "How does he saw me? A
   recommendation engine for picking heroes in Dota 2." Np, nd Web 7
   (2013).

 [2]  Ciubotaru, Andra. “Nahaz Interview: Balancing Dota, Family Life and Academia.” Dota Blast, 23 Jan. 2016, dotablast.com/nahaz-interview-frankfurt-major-dota-family-life-academia/.