Several years ago I was invited to a party at the home of a co-worker. At the end of it, he looked at me and said, "I'm glad you came." That was a very kind thing to say, the fact that I remember it after ten years attests to that.
Isaiah 53:11 is a sort of an "I'm glad you're here" verse. It's amazing to think that God looks on the results of Christ's atonement for us and is satisfied. Scripture is clear that God's opinion of us isn't very good, but it's also clear that His love for us is measureless. Here we are, lost and ruined sinners, and the eternal and holy God loves us.
He did terrible things to save us. And when He looks at us, He thinks those terrible things were worth it.