I was very satisfied with Stark's performance. He never fell for the players who wanted to sell a call and never gave a call to either team under the pressure of fans or players.
The player who finished was definitely onside. Even though it might have been a pretty easy call, it's worth mentioning since some assistant referees miss these calls as well, even at this level.
I am very impressed that Stark did not call the penalty in the first half for Lyon because even great referees would call those for the weaker home side.
Overall, there were no big complaints from players nor coaches, no one really argued the calls by the officials. I guess when you're right, no one can make a complaint.