I've ranted about Friends and Elves enough in other places, so I think I'll spare you the grief. Instead, I'll just give you a paragraph outlining my personal disdain for these lines(and specifically, their figures).
Psyche. I'm just going to go at it again.
I like that Lego is trying to attract a broader audience, but I'm really not a fan of the mini dolls. They're just so... specialized. I don't see why they need an entirely different style of figure for girls- It's as though they're specifically making them incompatible with male oriented(and gender neutral) themes. Among other lego figures they just stick out like sore thumbs. Additionally, they're not compatible parts-wise with minifigs or, in many cases, one another(courtesy of the advent of skin tones). They also hardly fit minifigure body wear, and come with even less of their own. In fact, the only things that you really get to modify on them are the hair styles.
I really don't like how Lego chose to go that route. It doesn't seem to do much but put a damper on creativity- I should know! Every time we go to the nearest Lego store, my sister is inclined to buy from the build your own minifigure station. Why? Well, because the sets that she tends to receive don't come with minifigures that you can customize. It's a special treat for her.