I can't say that I was a fan of the Sopranos or any gangster/mob type of movies or television shows, but I have caught some episodes of the Sopranos and I do agree that he plays the character and type that he was cast to play very well. He was very convincing as Tony Soprano.
I thoroughly enjoyed his acting in The Sopranos. He brought a certain realness to the role that made me respect him as an actor. In my opinion, his contributions were effective in turning "made for cable TV" from being an entertainment industry joke into an Emmy-class force that took on the big three networks. He continues to be missed.