Broad's side were eliminated from the Super 10 stage of the tournament on Saturday following their three-run defeat to South Africa in Chittagong.
"We've had a lot of positives come out of this World Cup," Broad told reporters.
"If we had got out of the group there would have been a lot of surprised people. We're disappointed, but we've done some good stuff with the squad available to us."
England conclude their World T20 campaign on Monday with a dead rubber against the Netherlands, who are also unable to qualify from Group 1.