Its good. If you haven't, you should try.
Graphics:
The graphics in Resident Evil 4 isn't all that perfect (well what is...?). What i do really appreciate though is the effort of Capcom trying to give all their best in designing and putting all the beautiful textures in the game.
Sound (and how it relates to the story):
Imagine this: you're coming home from work at 11 pm. Nobody's at home and all lights are off. You're nearing the front door with your keys jiggling and suddenly you hear the door squeak. You're a cop, and you pull out your gun with an offensive stance, ready to breach........ I'm exaggerating but the point is the sound of game can really make you feel that you're in the game and part of the story.
Is it worth it?:
I wouldn't say to you, "OH HELL DANG YOU GOTTA GO BUY THIS GAME, CAUSE ITZAA TRILLLAAA AND CANN OWN YAA!!". I suggest that anybody who's interested in action/horror/adventure games should give this game a try. if you cant take my word you can also see the other players' rating on this.......they HIGH!