I'm not a great movies watcher, also because of time dedication lacking in the latest years, but when I can, I like to watch again movies of my childhood and discover some new one which I find interesting. I neither have a great collection of movies, what the TV proposes has always been enough for me. I don't use to pay attention to newer movies of almost all the genres and to blockbusters, which most of the times shouldn't like to me.
I mostly enjoy the old and classic movies. About genres, in general I enjoy more comedies, thrillers, animation, some horror and futuristic dystopian sci-fi. I like the classic Italian comedy movies going from 1940s to 1990s (excluding the really trash and vulgar ones and the most recent ones, that suck), movies with Bud Spencer and Terence Hill, and the vintage USA comedy movies. I'm not fan of space sci-fi, medieval, legends and magician themed movies, so no Star Wars, Harry Potter and Lord of the Rings series for me, for example.
Here's my list of favorite movies, which I've enjoyed more, left something in me and got memorable.
Back to the Future series
Cars 1 & 2
Coming to America
Dennis the Menace
Fantastic Mr. Fox
Home Alone 1 & 2
I Am Legend
Ice Age (only the first one. Haven't watched and got interest to the others)
Kung Fu Hustle
Life is Beautiful
Lucky and Zorba
My Big Fat Greek Wedding
Nick of Time
Over the Hedge
Problem Child series
Sister Act 1 & 2
The Blues Brothers
The Fifth Element
The Fox and the Hound (only the first one. The second one sucks really bad)
The Hills Have Eyes
The Fast And The Furious (only the first one. The second is ok, the others not really)
The Last Emperor
The Mask (only the first one. The second one is really banal)
Tremors 1 & 2 (haven't really liked third and fourth ones)
Who Framed Roger Rabbit
These are interesting movies that I want to watch, and sooner or later I'll do it.
Need to watch again that movie, last time was many years ago. Really good one.