For all those planning on watching the movie, I highly recommend reading 'Before I Die' (the book it's based on)- first. From my perspective, the movie may appear bland and boring to those who don't.
And if you're looking for exceptional acting or cinematography, then this isn't for you.
This said, I won't call it a bad film; not at all. It's more about noticing the minute details, observing and comprehending the story beyond what's told. And the ending was extremely well done. The book simply digs deeper, and I believe genres like these need that deliberation. So do go on and watch it, but read the book first.