"It was a great opportunity for us after winning the group," said the Irish skipper. "We needed to deliver a performance similar to those against Australia and Italy but we turned over too much ball.
"Wales took their scores very well and showed they are worthy semi-finals and good luck to them.
"We got outplayed in the second half, they scored two good tries, maybe there was some weak defence but we are very disappointed to be going home."
Wales will now play France in next weekend's semi-final after they defeated England earlier today.