I thought they did an excellent job executing it. They gave Thanos great depth too. I am incredibly excited for the next one in the series, probably "Avengers: Endgame", and starting the transition from Stark/Cap to the new set of heroes.

I predict that Cap will have a very honorable death saving Tony in the next one. Then Bucky will become the new Cap, just like the books. Tony will retire and take over Fury's role as director of the Avengers.