Lucic wasn't that overrated, because she was indeed very good. She under-preformed by a lot though. Overrated maybe Harkleroad, because in the US she was hyped up a lot despite it being obvious she didn't have enough of a serve or power. There is probably someone who was even more overrated, but I can't recall them.
Tatiana Golovin, Timea Bacsinzky, Petra Kvitova, Kristina Mladenovic, Laura Robson