Arsenal's 0-0 draw with Sporting at the Emirates saw them win their quarterfinal tie 1-0 on aggregate.
At the final whistle, Hjulmand said: “I think it was an even game.
“The impact of the first game, that we lost, made it more difficult to go to the Emirates and win, especially when we don’t often lose at home. We knew it would be difficult here.
“But the game had low intensity and no rhythm, zero goals, and I would say boring.”
On why Sporting couldn't get their game together, the Dane continued: “I think a lot stops during the game, so we couldn’t get the rhythm that we wanted to. A little bit boring.
“If I was a viewer from outside 0-0, also the first game 1-0 it’s not the way Sporting wants to show itself. We want to score goals, create chances and we didn’t do it.
“During the game I felt a lot of stops, especially during set-pieces and it takes a lot of time out of the game.
“When we did get the rhythm, we did create a lot of chances, especially in the first half. But at the end, we didn’t create enough to win the game, to be honest.”