Oh, a Supercell thread!
I first heard of them back when they did Black Rock Shooter - I think that was probably their most popular song at the time. But I was surprised to hear they made the ending song to Bakemonogatari, "Kimi no Shiranai Monogatari"
After that, I listened to songs like
Hero and
Good Bye Memories. I haven't heard LOVE&ROLL,
>>8, but I feel like the emotion in her voice is appropriate in those two. If anything, I think overshooting is better than being underwhelming - it gives value to the musicality, at least.