I'm not saying this is typical for all Pop music. Your mileage may vary.
Several years ago, I was talking with my niece about bands she liked. She loved Smashing Pumpkins. I asked her what she liked about their music. She said something along these lines. (I can't remember the actual comments.)
"In this one video, this guy wore this really cool shirt that was black with this cool design across the front. This other guy wore these cool jeans and his hair was spikey and he had a nose ring I liked. Oh! There was this other video where Billy wore..."
After about 15 minutes of descriptions of every single article of clothing, makeup, hairstyle, nasal hair styling, etc., I asked, "What do you like about their music?" She looked confused, since she had already answered that question.
My kid's friends say you know a song is good when they're are lots of dancers on the stage. (I've always found the opposite to be true.)
I don't know. This isn't unique to today's youth by any means. For those who remember such things, the common answer when asked about a new song on American Bandstand was, "It's got a great beat. I can dance to it! I give it a 10!" Shameful, isn't it?
I'm too old to be of any value, but I like music that takes some measure of skill to play. I like songs that evoke a feeling or a mood. I like lyrics that say something. I like singers who know that passion is not about your dance moves, but about your soul. I want real Artistry. I want creativity. I like a song that resonates with me, where I can't stop thinking about it, where I personally identify with it.
That's what I want to hear, regardless of the label that is placed on it. Rock, pop, funk, metal, electronica, dubstep, etc. - I want something that blows me away.