I think it's important to look at how horror movies, and horror media in general, reflect the fears of those producing them. The movies that fail are the ones that don't match up with society's fears. Any successful horror movies play off of the most basic subconscious fears of the society they're released in - monster movies in the 30s and 40s played off fear of "The other", Kaiju movies in the 50s played off fear of the atomic age, zombie movies in the 50s and 60s played off the fear of people that look just like us but suddenly aren't following all of our rules, primarily due to the civil rights movement, etc etc.
So you have to wonder what movies are being successful right now, and how that coincides with society's fears. I think we can see a rapid change in genre over just a few years, from the 2000s to now we've gone through the zombie revival but now they're extremely brutal, the SAW torture craze, Paranormal Activity's unseen force craze, and a dramatic amount more. I think this shows that society's fears aren't as simple as they used to be, probably because of the internet. People are no longer listening to just what the government and big news are feeding them - to be afraid of immigrants, or of the black people, or of the soviets' bombs. Now people are afraid of a lot of things - they're afraid of the government, they're afraid of society collapsing, they're afraid of losing control, and a number of other things.
The horror comic that I write, Stalker, I write by consciously taking into mind what I, and people like me, are afraid of. Personally, I'm afraid of the police state, I'm afraid of fear mongering by the media as well as it's result in droves of people lashing out against people who don't deserve it. That's reflected in my comic, and it'll only succeed if society agrees with those fears. But I suggest that when writing horror, to write about what scares you, even if society might not immediately agree with you.
Is your comic uploaded yet? I'd love to see it, you should link it. To answer your question of, is horror getting better or worse - I don't think either is possible. Horror can only succeed by emulating society - to get better it'd have to predict it and show something even scarier than what we're afraid of, AKA The thing we'll be afraid of next, which is generally impossible. To get worse, it'd have to play on what we're already no longer afraid of, in which case it wont get any attention. We may not like the way horror is going, any individual saying "The old horror movies are scarier!", but that can be chalked up to our fears simply not evolving with the rest of society. Wait about 10 years and the whole scene will be vastly different, and we may like it more then.