The Iron were outclassed by Boro, who scored through Kris Boyd after eight minutes and Tony McMahon after 69.
"Both goals came from us being in possession. We've given the ball away too many times in critical areas, when we had good possession and cold go on and hurt them. There was a lack of care in the pass," said Baraclough.
"There were spells where we played well. It's strange really but I'm really upbeat about where we go from here until the end of the season because I know the group that's been put together is a good group.
"There's a togetherness that, backs against the wall, will come good. The injuries and illnesses of the past few days have hurt us for sure.
"It was always going to be difficult to come here. It was disappointing that when we had possession that final ball was not quite right.
"There first goal was a bit sloppy all round after we had started brightly. But we didn't let our heads drop, we played well in spells but without really hurting them.
"Deliveries into the box could have been a bit better, with just that little bit more care with the final ball we could have got something."
Baraclough was unhappy at the red card shown to midfielder Abdi Ibrahim for two bookings, but did praise referee Rob Harris for overturning a penalty decision.
Harris awarded a spot-kick after Leroy Lita went tumbling in the area, but there was no contact from Andrew Wright and the Boro forward was booked for diving.
"He was booked in the first half and the referee pointed to three different areas where he made tackles and I can't remember that at all," added Baraclough.
"I'm not going to get myself in trouble but I thought there were some decisions that were baffling. It was a ridiculous penalty shout and quite rightly overturned."
Tony Mowbray, the Middlesbrough boss, disagreed on the referee decision to reverse the spot-kick,
"I can't remember a referee giving a penalty in this country and then changing his mind because his linesman talks him out of it," he said.
"The fourth official told me there were three or four men in his way, but surely he's got to see it to give it. Why is he letting his linesman, who is 60 yards away, talk him out of it?"