As a footballer, he was immense and very good in what he does. I mean team can adapt to different playing style but you need to have the right style of player. He was very important to our formation. People may overlook his contribution because most people probably thinks as long as you have the determination, any player can do it. But it is not as easy because his timing, fitness and marking is just as difficult to do as a skill player would with dribbling, shooting etc. I mean Kaka can't do what Mascherano does and vice versa. Just because he is a defensive player doesn't mean he is overrated. But I can't force everyone to like him since people tends to appreciate skillful player that looks good.
The fact that Barca wanted him say someething about Mascherano. YOu don't see Lucas wanted by them
