I'd say since the mid 90s horror films have gone to crap personally. There are many films in the 80s that are classics. Alien(I know 1979, but still), Carpenter's The Thing, and the Fly remake are great. Modern horror films though... I'd say I have seen maybe 2 to 3 made since the mid 90s to today that I think are genuinely good.
For me, while I love the Universal horror films of the 30s and 40s, my heart is with Hammer. There is just something about the Hammer films that even the not so great ones have such class.
And I also have a thing for 70s horror films in general. What's weird is that I am not a splatter guy, but the films of the 70s considered spaltter films are classier and better made than anything that came later.
My former friend Jon Skocik made an indie horror film in 2005 that I am in called The Traveler. It is a splatter film, but we genuinely tried to make it hearken back to 60s and 70s horror films, and make the gore stuff actually mean something and not just be there for shock value. The film is on his Youtube channel should you be interested.