None of his films is of any importance to the genre. Outside of the 60s-Italian-genre-fan-world nobody has ever heard of him.
If none of his many too many Spags had been made, nothing would change in the reception of the genre.
Well, he was a bad actor, and his typical SW looks, which looked charismatic on photos, looked lifeless on the screen.
Surprisingly he was quite lively when he played, instead of the usual taciturn hero, in a more self ironic mode. That’s why Last Train to Durango and Dead Men Don’t Count are his best performances. And also belong to his best Spags, together with Django the Bastard, Garringo and Why Go on Killing? .
Some of his other Spags, like this one here, are also not bad, but as I said none is of a certain importance.