Well there are many timeless classics and plenty of old movies are simply amazing. On the contrary new movies developed from the Old ones, learned from them and got inspiration.
Yeah sure many people say Old Movies are Originals but to be honest, every idea has existing before and even the old movies just adapted from books or history.
From my point of view the modern cinema is qualitative better because they have way more options to express what they want to show. Clearly there is more crap out there in nowadays then in the past because everybody can do all kinds of movies but if you select the movies you like, then I think there is way more quality out there today then in the past.