Despite playing for Barca's bitter rivals Real, Benzema was ready to give credit where it was due, and paid tribute to the Catalan side.
"There is absolutely nothing you can do about what we saw on Saturday," Benzema told France 2. "Barcelona really are a great team to watch."
Benzema also conceded that Barca had totally dominated United on their way to claiming the Champions League title.
"They were superior to Manchester United and dominated the match. United had a good start, but Barcelona were unstoppable once they started playing their own game."
Benzema, however, believed that Real's 1-0 victory over Barca earlier this season in the Copa del Rey final proved that the Catalan side could be beaten.
"We beat them in the Copa del Rey final so they can be beaten. However, there's no doubt that they are a great team."
Real were one of the sides to fall to Barca in their run to the Champions League Final, having lost 3-1 on aggregate in a heated semi-final clash.