Utd were superior in the attack and technical skill and defended well for most of the match. Benfica tried to counter with a very energetic pressing game (and it paid off) though they ran out of gas a little as the game went on. United's midfield is fairly porous at the moment, Benfica ran through them again and again. The commentary was horribly biased in favor of Utd on Fox Soccer Channel. For as much as I hate Gary Neville, I have to say he makes a decent commentator - you just should never have him comment on Utd, it's almost pornographic.
Regardless of how you feel about Utd, you have to give Benfica credit for going to Old Trafford and playing as fearlessly as they did. Had they sat back they would have lost for sure.
City are in a much more difficult group but I think they still have a very good chance of progressing. Napoli is obviously a very difficult place to go and get a result. I wish I could say the same about Anfield these days.