I realize that good is a pretty broad adjective, but so is my list of good movies.
To narrow the list down just a bit,
I find that many of my favs are black and white, and have wonderful leading men like James Stewart and Fred MacMurray
leading women like
Katharine Hepburn and Myrna Loy.
A great director / producer is also a key factor. Cecil B. DeMille and Frank Capra ... now there you have the makings of a great movie.
My favourites are usually funny, or heart-felt, or romantic or a combination of all three. Although a well carried out scary movie with twists and turns, is also very much enjoyed.
And what about the musical score? Makes a huge difference in how a movie is received. Think about it.
AND the lighting, AND the costumes, AND the camera angles. AND the dialogue.
Boy, don't you just love those old movies?