I'd like to take this opportunity to give a shout out for Double-Fine productions' Brutal Legend, available on steam and various consoles.

Instead of explaining in detail my experiences thus far, I think it will be more effective to simply list off what you will find in this game:

* Jack Black
* Ozzie Osbourne
* Tim Curry
* Exploration
* Combat Driving
* Lots of brawling
* Surprisingly, RTS mechanics
* Way more metal than you can shake a stick at, including:
* Classic stuff like KISS and Black Sabbath
* Newer stuff like Dragonforce
* Some tongue-in-cheek stuff like Tenacious D and Dethklok
* Guitar solos that literally melt faces
* A really awesome roadster
* EXPLOOOSIOOOOONS!
* Exploding steel-blade-quilled porcupines
* Bear-things with chromed faces
* Laser Panthers
* Some kind of giant zombie-sloth slash guillotine monster
* The above three things are all ridable
* A rich creation-mythology explaining the heavy metal fantasy setting
* The opportunity to thrash glam-rockers
* Demonic sado-masochist attack squads
* An uncomfortable amount of demons in pink bondage
* Zombie M-preg
* No seriously, Zombie M-preg
* Humor at every turn
* A low price (especially if you grab a used console copy)