If a movie speaks to you on an emotional level and if it has great significance to you, you may call it great. Greatness is not achieved in art through technical skill. Shakespeare's writings are not famous simply because he employed Iambic Pentameter in his writing, they are great because of what he used words to tell, and the connection that makes with people and their lives hundreds of years later. Personally I find Shakespeare very over rated, but that's just me, I find there are other authors who better speak to me.
Some of us may choose to talk about film in a very objective fashion discussing cinematography, lighting, musical score, pacing, plot, etc however some may choose to simply enjoy the experience on film more than discussing it and dissecting it.
Certainly there is nothing wrong with either approach to enjoying film.