Yes, many would slate these films we celebrate, labelling them as derivative crap, but we know better. We know that same said people trash the reputation of the genre's finest directors and insist on referring to them as 'hacks' but many of the guys in question have been inspirational to the directors their critics praise.
So what defines one of these films for you? To me, it's the assembly of elements that give the films their unique style. Take a look at the opening sequence from Fernando di Leo'sseminal MILANO CALIBRO 9. The scene depicts the every stage of a bag drop, a scene that would have been formulaic in just about any other movie becomes a cinematic tour-de-force in di Leo's hands; brilliant editing, gritty cinematography, brutal violence and a wonderfully unique score from Luis Enrñuez Bacalov combine to create an astonishing whole.
Over to you. Give praise to the films you love by singling out a scene (or two) from one of your favourite films - a scene that can be waved in the face of all those that dismiss these films...