I agree with you. Many horror films these days lack any originality, they repeat the same trash that's been done a hundred times over. The Paranormal Activity films were just awful! I only watched the first...that told me enough not to watch the rest...I was bored stupid.
I also hate the way that Hollywood keeps re-making horror films that are already good films - Evil Dead, The Thing, The Ring etc. There are however a few out there that are quite good....none of them are Hollywood which says a lot...you may want to check these out if you've not seen them already:
A Serbian Film - this one is for serious horror fans only...if you thought Saw (yawn!) was good or Hostel was gruesome then I suggest that you DON'T watch this film; it's seriously nasty! Personally thought it was excellent.
REC - Spanish film, quite interesting, perhaps not the most original but well done.
The Descent - Classic British horror, lots of tension.
Ichi The Killer - Great little film, loads of really over the top stuff. Loved it.
Old Boy - More a psychological head f**k film than a horror but good anyway.
Dog Soldiers - This one is more for laughs but I thoroughly enjoyed it.
Martyrs - French film, fairly gruesome in parts, well worth a watch.
Frontier(s) -2007 - French film, not as gruesome as Martyrs but still fairly original.
Enjoy :-)