Raining Blood is one of the worst songs ever made. It's just pathetic. It repeats itself, and has nothing but guitar a drums played really fast to the extent that all you can hear is a caccafony of noise.
Through the Fire and the Flames also sucks, because it's Dragonforce, and the song sounds really lame and corny and it's digitally enhanced.
But if I had to pick one... Oh god, I choose death.