Ferguson said: "In my time as a manager it is the best team we have faced. I think everyone acknowledges that. I accept that. It's not easy when you have been well beaten like that to think any other way.
"No one has given us a hiding like that. It's a great moment for them. They deserve it because they play the right way and they enjoy their football.
"They mesmerise you with their passing and we never really controlled Messi. When we got the lifeline of Wayne Rooney I expected us to do better in the second half but it wasn't to be."