Well I thought it would be interesting to insert some stats into this discussion. But I guess Carrick is just another misunderstood genius.
Football isn't a game where you can look at stats and completely understand a player's contribution or worth to a side.
Carrick played a role where dictated the tempo of the side through his passing, and shielded the defence extremely effectively. You don't have a stat that shows you how someone dictates play, or changes the tempo. You don't have a stat for how Carrick would know the pass he was playing before he even got the ball and often bypassed a midfield or defensive line, nor for how many times he would be the one providing the penetrating ball before an assist. The most obvious tell is how much worse we always looked when Carrick didn't play; far more disjointed, less effective defensively and struggled to play quick pass and move football.
I'm a big Matic fan, and at times for us he has been immense, but he is not as instrumental as Carrick was.
As for the game, I think we were relatively comfortable for most of it. Defensively we were solid; in a late-stage European game you expect to concede some chances and we did well to protect Romero's goal. We created more than enough chances to win, and while you'd rather not go to extra time we got there in the end. We're a tough side to beat at the moment, looking forward to Sevilla.