Eoin Morgan felt England let themselves down with the bat after they slumped to a six-wicket defeat in the first one-day international of the series against Pakistan on Wednesday.
England fell to 14-3 in Abu Dhabi after winning the toss in the first game of the four-match series before captain Morgan (76) and James Taylor (60) put on 133 for the second wicket.
The tourists then collapsed from 147-3 to 216 all out, with Mohammad Irfan taking 3-35 and only Chris Woakes (33) making a contribution of note down the order.
Pakistan were reduced to 41-3 in reply, but Mohammad Hafeez made 102 not out and Babar Azam an unbeaten 62 as they got home with 38 balls to spare at the Sheikh Zayed Stadium.
Morgan was left to rue England's shortcomings at the crease in the series opener.
He said: "We were slow out of the traps today and given the repair work that me and James Taylor did it's very disappointing to lose us two in the space of four or five overs.
"Stokesy [the injured Ben Stokes] leaves a big hole, but one of the things we pride ourselves on is batting as far down as we can. The batting let us down massively today."
Reece Topley gave England some grounds for optimism by taking 3-26 in only his second ODI and Morgan believes the left-arm paceman has a bright future.
"Long-term he's certainly somebody that we are looking to nurture, particularly for his white-ball skills. He's very good for a 21-year-old," said Morgan.