It's not really a ripoff, but obviously it would never exist without The Sopranos. one thing you really need to understand is that Sopranos set the standard for serial dramas from the turn of the millenium onward. almost every television drama is derivative of it in some way. SoA, honestly, is not so much outside of the fact that it follows a gang of criminals. The Sopranos is a series that has a more stable basis around the one character, Tony Soprano, and his balance of family and criminal life. SoA has a couple central characters who are more like TV hero and villain archetypes than real people. also the styles are completely different. Sopranos had more of a deliberate, cinematic approach, while SoA is a fast-moving handheld gangster show.
Taps, lights out, 2200 hours. What's missing? Give up? Television.