I sort of understand why this show will not appeal to many. It's funny and satirical and although it has all the prerequisites of being, it is not your everyday all American humor. Although the plot is nothing new I think that in a way it is really smart, since it's rich vs. flirty rich, so in its core there is something utterly funny and a source of constant ridicule.
The main character is at first sight annoying, but as we can see half way through the first season we can see that she is more complex then we think, so she seems 'more real' than the rest, but I find that quite interesting and appealing.
Some of the other characters are beyond limits caricatured, so that adds to the comedy element of the show, without leaving you wondering 'why is this happening?.
All in all I really think that everyone who is looking for a pinch of fresh comedy and wants to watch something new, should definitely give this show a go without taking into consideration its (unfair) ratings or the simplicity of the plot.