Rooney's 79th-minute header gave United a 1-0 win over CSKA Moscow in the Champions League on Tuesday night and moved him up to second alongside Denis Law in the club's all-time scoring charts.
Herrera said: "He is one of the best players in the world. I try to not read (what the critics say) too much. I try to create my own opinion and my opinion is clear - Wayne Rooney is one of the best."
"He is one of the stars, but he is not selfish. If he scores of course it is much better for everyone, but if he doesn't score, he fights in the same way.
"The way he trains and the way he gives to the rest of the players his opinion, everything. Maybe the people outside see only in the pitch, but he is also very very important outside for everyone."