The Tigers found themselves three goals down inside 18 minutes and never looked like recovering as they remain just above the Sky Bet Championship drop zone.
“We were poor and there’s no point hiding behind it,” said McCann.
“Just the basics in terms of picking up the first and second balls, their front three winning a lot of headers which they’re not renowned for. We were lacklustre and we got what we deserved from it.
“The first goal is soft – we’ve let a runner go on the far side to put a free cross into the box and we don’t see Powell at the far post. The second is from a penalty and, although it looked like half a push on our player, it was a handball and we have no complaints.
“We looked all over the shop in that first 15 or 20 minutes. We’re a little bit low and a little bit flat so we need to pick them up. Confidence is a bit low after recent results.
“For large spells in the second half we played alright and we had a couple of opportunities, but again we switch off and they score a couple of goals.
“We have to dust ourselves down because we have nine big games to go and we need to find our way again because we’ve lost it a little bit. We need to concentrate on working hard to get out of this rut that we find ourselves in.”