"The New Romantic" isn't terrible, it's just bland. Plot-wise, nothing particularly interesting happens the entire movie. The movie just kind of meanders through 2-3 plot-lines without digging very deep into any of them. Additionally, neither of the two main plot-lines are actually closed out, however because neither storyline was really fleshed out in the first place you don't really notice or care.
Since this movie is more of a romantic comedy, a dull plot would have been acceptable if in its place there were some form of character/relationship development. But, because the plot is so thin and the pacing is relatively slow... the main character doesn't really interact with anyone outside of her roommate in more than 3-4 scenes, meaning no real development takes place.
The net result is a movie that just kind of exists for the sake of it. "The New Romantic" wasn't bad, but I honestly don't think anyone would notice if it didn't exist.