Yes, this IS a horror anthology film and it was a lot of fun! That's because although the film clearly was horror, some of the stories had a light spirit--and there were even occasionally a few laughs. This isn't at all a bad thing as sometimes horror films are a bit stuffy and overly serious. Because of this and because all four of the stories were pretty good, it's one of the better movies of this style I have seen.
The unifying theme that connects each story is the house itself. Four different stories involve people who either rent the home or investigate what happened to the tenants.
The first segment starred Denholm Elliott as a horror writer who has writer's block. So, for a change of scenery, they rent this house. Almost immediately Elliott's block vanishes and he works steadily on a tale about a serial killer. Amazingly, soon after his block vanishes he begins to actually see his fictional character! Again and again, the psychotic killer appears and then disappears--making it seem as if he is losing his mind. This might just be the best of the stories, as the nice twist ending makes the story come alive.
The second, while not bad at all, is probably the weakest. Peter Cushing plays a bachelor who is pining for a girl friend who died some time ago (though the picture of her looked amazingly contemporary). When he enters a chamber of horrors wax museum in town, he sees a wax figure that reminds him of his lost lady and he is both fascinated and scared by this. Later, a friend (Joss Ackland) visits and he, too, sees the figure and is entranced by it. This all leads to an ending that, frankly, was a bit of a letdown.
Christopher Lee then stars as an incredibly harsh and stern father to a pathetic little girl. During most of this segment, Lee seemed like an idiot, but in the end you can understand his demeanor. Though slow, this one ended very well.
The fourth segment was the silliest and was meant to parody the genre. Jon Pertwee (the third "Doctor" from the DR. WHO television series) is a very temperamental actor known for his portrayals of Dracula. However, nothing is right about the film according to him and in a fit of pique, he stomps off the set to find better props for this vampire film. It's actually pretty interesting that he played this role, as it seemed like a natural for Christopher Lee who played Dracula or other vampires a bazillion times (give or take a few). I enjoyed Pertwee's line when he basically said that Lee's and other recent incarnations of Dracula were all crap compared to Bela Lugosi's! Perhaps this is why Lee didn't take this part! Despite some very silly moments, it was very entertaining and fun--possibly as good or better than the first segment.
Considering that the film started and ended so well, had excellent acting and writing, it's hard not to like this film.

Obvious attack on Microsoft made by people who don't appear to understand intellectual property or market economies generally.
Loony liberal tim robbins plays a painfully obvious caricature of bill gates, and is a cartoonish corporate villain ordering murders right and left.
While microsoft may engage in some anticompetitive activity at times, it's unlikely they actually murder people. Therefore, the film is over the top and ridiculous from the beginning.
The "deeper" point is apparently that major tech innovations should be free to the public, and not subject to intellectual property laws. However, this ignores the fact that most major innovations would never have been developed if not for the market incentives (and rewards) provided by intellectual property.
It's one thing to be opposed to anti-competitive conduct -- that's common sense. It's quite another to be opposed to market competition in the first place, which is what the film's mantra ("knowledge belongs to mankind") represents.
Yet another example of Hollywood being completely out of touch with reality.