REGARDING GRAPHICS: Twisted Metal games have always had not... spectacular graphics, but this game DOES have better graphics than its original version (available for PSP). More specifically, the special effects and explosion effects are all enhanced, the vehicles were re-rendered to be more life-like, and the lighting and textures in the stages have been touched-up. I give the graphics of TMHO:ETE a 4.0 out of 5.
REGARDING MUSIC: I've never actually had problems with the Twisted Metal 'Twisted Symphony'; I find that the music for each level is suitable. The basic musical theme for the Twisted Metal series has always more-or-less been hard-core heavy metal, usually late 70s to 80s, Def Leppard style. The music for the series is awesome and really helps to immerse the player into the world they are destroying. My personal favorite tracks from TMHO:ETE are 'Vampire's Teeth' and 'I've Got a Sweet Tooth'. They really fit the theme of TMHO:ETE and are generally just awesome...