On a show that's all about the relationship between Oliver and Felicity, Felicity's short-lived relationship with Ray felt like a mere plot device to throw in some drama. There was a severe lack of chemistry between the characters.
Laurel Lance was the District Attorney who became a crime fighter. It was a ludicrous plot, but the myriad of hurdles she faced along the way made it worthwhile when she officially became the Black Canary. By that time, though, Katie Cassidy's screentime had vastly diminished, and the characters was killed off in a truly bizarre twist.