Boss Keith Hill was encouraged by his side's performance even if frustrated with the chances missed.
Hill said: "I am pleased with the performance, tinged with disappointment that we didn't make hay while the sun shone.
"We had a lapse in concentration and conceded the goal. But I am encouraged by the way we are playing with the ball.
"I think that I am starting to make an impression and stamp my identity on the way I want to play football. I am seeing light at the end of the tunnel.
"It's great education for me, I know what I want and I am encouraged by the last two performances. But I am not here to make friends, I am here to do my business and make a success of my time at Barnsley.
"The result could have gone against us and the fans could have gone against us but I am pleased with the way the crowd stayed with us, we keep putting the performances but we need a result."
Watford boss Sean Dyche lauded his team’s defensive strengths.
"I didn't think that we got out of the box today and we weren't on the front foot," he said.
"What we did do was that we showed some terrific defensive qualities.
"It was a well earned point. I thought on chances that Barnsley didn't create enough but they played better football than us. As the first half went on I always fancied our chances to nick a goal which we did.
"I felt that it was good finish to get the goal. In the feel of the game I thought that we were lucky to be still in the game when we scored.
"When you concede a goal you always think that it's down to you and not good football on their part."