Mark Duffy thought the Blades did more than enough to warrant taking all three points from Friday's Sheffield derby.
Speaking after being held to a goalless draw at Bramall Lane, the experienced playmaker admitted it was a frustrating evening.
He remarked: "We reflect on that with disappointment to be honest. They came here to do a job and if we'd got the first goal they'd have had to come out and attack us, which would have left gaps.
"It was one of those nights, we couldn't get that elusive first goal and their goalkeeper ended up getting man of the match.
"It's difficult regardless of the division or opposition, if they sit in and aim to frustrate. They fill gaps, they've got ten-men behind the ball all the time, but it was down to us to try and open them up."
Duffy added: "We did that for the penalty and if that goes in it totally changes the game. They would have had to attack and it could have been anything really.
"The more of the ball you have, the less opportunity the opposition have to score. We had a lot of the ball in the final third, it was just about picking the right pass and maybe getting the ball into the box earlier to mix things up.
"But to a man we're still learning and this team will only get better and better."