i've only seen the first one and i did find it unnerving, but i generally get creeped out by ghost films.
It was well made and creepy but i haven't been inspired to watch any more of the series.
Also personally i found the end shot to be unnecessary, for me it lessened the films impact because it seemed unnatural while the rest of the film was more effective.
I don't want to give anything away in case Dem is going to watch it but i'm sure people who've watched it will know what i am referring to.
Actually i just rewatched the end on youtube and i seem to remember the final image being more over the top than it actually is, so i'm not sure what was going on in my head at the time.
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MIKE: I've got it! Peter Cushing! We've got to drive a stake through his heart!
VYVYAN: Great! I'll get the car!
NEIL: I'll get a cushion.