Predictable, but different at the same time.
The overall plot was what was predictable; a less-than-moral man falls for woman of his dreams, works to win her, and settles into a respectable life as they sail into a sunset. It was no real surprise when the couple splits, then gets back together, nor the fact her father was upset at first, but ended up liking the guy. There were a handful of stereotyped characters and overly-anthropomorphized animals. The gags were nothing special, but at least they were (mostly) on the funny side of average. The unusual part was the story; a man falls for a woman who cannot remember him, has to win her over time and time again, and eventually marries her, although she continues to forget every morning what happened the day before.
Lucy suffers from a rare brain injury, causing the part of her brain that transfers information to long-term storage while you sleep to fail. Every morning she wakes up convinced it is her dad's birthday. A few people work to protect her from the truth, living over the same day again and again. There are some humorous elements, but overall the sequence that explains this is sad. Nothing in the picture is sad, per say. Everything looks like a bright and sunny Hawaiian day. The understanding of the viewer translating itself into the film is what provides the melancholy tone.
It is impossible, I believe, to make a viewer understand something as complicated as Lucy's situation in a movie. The film was respectable and compassionate in the presentation of the information, though, and threw in only a few gags. Most of the person-centered humor was directed away from her. I thought the movie was entertaining and worth the time.