By Colette Bennett Fans are bitter over expensive microtransactions in “free-to-play” mobile game. On June 2, longtime gaming publisher and fan favorite Activision Blizzard (ACTI) released its first mobile game themed on its “Diablo” franchise. After a long, tumultuous year involving more than a dozen lawsuits over sexual harassment, investor unhappiness about its upcoming sale to Microsoft, and complaints about CEO Bobby Kotick, the company was sorely in need of some good press — especially in the wake of a first-quarter revenue decline of more than $500 million year over year. Releasing its…