I think Christopher said it best in "Mayham:"

Alex and Piper are the worst. They deserve each other. And I actually kind of like Larry and Polly. They seem like a much better fit than Larry and Piper.

I am finding Piper less and less likable. She just seems like a whiny little bitch who is easily manipulated by Alex. Who, let's face it, is not as smart as she thinks she is.