You see, that's why opinions and views differ.
I think The Entity is an extremely poor film, and The Amityville Horror, regardless of who stole what from where.
I could explain why I think Poltergeist is a great film, but I'm not going too as I have done so many times already in the past. As I said also, opinions and views differ.
I don't find any horror films to be scary at all anymore, regardless of their time period. I did for a brief period when I was a child though. I find such notions now to be nothing more than a generic excuse used merely as a form of crediting or discrediting the particular film in question. How scary it is has never appealed to me in the horror genre. A film can scare the living daylights out of somebody else, yet still retain a horrible script, editing, music, etc, like The Entity (I had to chuckle when you are bashing Poltergeist and then go and regard one of the worst in the genre of that decade as the best). It's everything else that intrigues me about this genre. Film is an art, one in which to be analysed and studied. I find the horror genre to be particular fascinating where the material calls for it. I understand when something is scary, I'm just not scared by it. There is a difference.
I agree with what you said about Heather O'Rourke however. I've made my feelings very clear about these types of people on many occasions. It is indeed quite disturbing.