i totally agree. this is pitch black underground and a well worn plot. the best scenes i thought were the divers exploring the caves and going through impossible subterranean passageways and some of them were heart pounding. the scenery was great. had they dispensed with the staple alien toothy cgi badboys entirely the movie would have been much better. all they would have had to do is never show any monsters at all but have everyone wondering and and follow jack descent into madness and and this might have been a top rate hitchcock style thriller and maybe award material. the acting isn not bad. but those rubber bats just reduce it to standard fare. 
i totally agree. this is pitch black underground and a well worn plot. the best scenes i thought were the divers exploring the caves and going through impossible subterranean passageways and some of them were heart pounding. the scenery was great. had they dispensed with the staple alien toothy cgi badboys entirely the movie would have been much better. all they would have had to do is never show any monsters at all but have everyone wondering and and follow jack descent into madness and and this might have been a top rate hitchcock style thriller and maybe award material. the acting isn not bad. but those rubber bats just reduce it to standard fare. ---------------------------------Answer Question Below----------------------------------

Judge the movie review above, you need to make a function call:
    If you feel the movie review is positive
        print "This is a semantically positive review."
    Otherwise, if you feel the movie review is negative
        print "This is a semantically negative review."
