She made a impression on me, but not a wholly positive one.
The thing is she's basically Rarity...without any of Rarity's redeeming qualities. Izzy kind of has Rarity's creativity. So, she's kind of left with being the most dramatic and narcissistic one of the group. And then...there's the social media influencer/idol stuff, which was the only time in the whole movie that I felt the need to cringe a little. Maybe ponies with phones will just take me a while to get used to.
But, I also think that makes her the pony with the most room to grow. I feel like she might undergo the most character development, once the show actually gets going.
I guess it'd be interesting if they played up the musical idol stuff a little. Basically, give her a background crew and turn her into Jem and the Holograms. Or give her a Jabberjaw and go on musical mysteries while she tours, or something. That could be fun.