Liked it, but ending pissed me off

It was a good, solid thriller (which reminded me a lot of Carpenter's Assault on Precinct 13) but someone couldn't resist throwing in a head-trippy ending to negate or at least question everything we just saw as "was the main character insane?", or "was it all a dream?"

Really, this sort of ending has been done to death so often calling it trite or hackneyed doesn't begin to describe how cheap and contrived it has become in our post-modern age. Because of it, a film I would have rated higher I now have to lower to about a 7.

Note to filmmakers (any and all): It's ok--really, it is!--to just END your story after all the action resolves itself...you don't always need to try and come up with slam-bang shock or eerie moment for some kind of BIG FINISH! to your story. It's really just a gimmick nowadays.