Instruct: Classify Amazon reviews into positive or negative sentiment
Query: a real mystery

I saw this movie soon before it was released theatrically. I knew the screenplay had won at Sundance, but there was virtually no hype or word-of-mouth. What I saw was an incredibly bland, boring film, a little dollop of sentimentalism that might have cut it on TV but as a film was a huge waste of time. Then the reviews starting rolling in, and I was totally dumbfounded. What movie was everyone watching? Mark Ruffalo does a great job, and Kenneth Lonergan's acting turn was a highlight -- but the screenplay?I should advise heartily against anyone's seeing it, except for the fact that everyone seems to like it. So here I am, forced to resort to these quiet little displays of baffled, anonymous dissent.