You can rly notice the double vocals, if I remember correctly he didnt wanna double the vocals on the tracks but his producer explained that this is how John Lennon would do it most of the time. And that made Kurt more accepting to it.
Kurt was an innovative songwriter and a damn good singer. His "screams" here are top notch during the chorus. His pitch is right on. People who bashed the band just didn't have ears to hear with.
Without deep listening you'd think he was just talking and yelling but when you actually pay attention you realize just how talented and unique his voice is and how wonderful Kurt sounds. God bless his voice and may he rip