Honestly the negative attitudes about John Riccitiello largely come from gamers who know basically zero about business or what a CEO even does.
I can't speak for the majority of gamers but the reason I disliked him as CEO is because of how bad the entire company was under him. If it was just the odd bad game from EA there would be little to criticize him for; under his reign EA was notorious for treating paying customers like dirt and consistently ruining great franchises and great studios. That is a direct reflection of who was at the helm at that time imo.
“The greatness of a nation and its moral progress can be judged by the way its animals are treated.”
- Mahatma Gandhi