If you can't sing, this probably isn't the game for you. If you enjoy singing, you owe it to yourself to give it a shot
Karaoke Revolution Party, having come out before Guitar Hero, lacks some of the polish that its sibling will have but it's still the total package. Whereas Guitar Hero requires you to strum particular fret keys at a certain time, Karaoke Revolution Party requires you sing on key... and it really does.
Karaoke Revolution Party comes with a very decent Logitech USB microphone and uses the device to track the tone in your voice, regardless of whether you're a male or female single, a soprano or a falsetto, the game's got ya covered (in fact, this is one of the most impressive parts of
the game -- regardless of what octave or key you sing a song in, the game will track you and show you whether you're too high or too low). However, it's at this point where I have to warn you, if you can't sing, this game is unabashedly unapologetic -- you'll be booed off the stage and fail the song. Easy and Medium judging are fairly forgiving, but the Hard rating is for people who definitely aren't tone deaf.
But, like most rhythm games, the key component of Karaoke Revolution Party is in its song set. Other reviewers, including Gamespot, claim that the game has to eclectic a collection of songs. I totally disagree; its this variety that makes Karaoke Revolution Party a party game. The selection of song choices virtually guarantees that everyone In your party will find something that they want to belt out to the amusement of everyone else.
In fact, the only two missing genres seem to be rap and country (and both are sorely missed; some Eminem and Garth Brooks would work real well). To make up for this Karaoke Country came out recently and I got a chance to try that; seriously, if you don't like country music, stay far, far away because some of this is really thick ("She thinks my tractor's sexy" is a real country song on it, no joke).
All in all, the Karaoke series seems to be on the right track. I'm holding out for a good rap collection with maybe some old school DJ Jazzy Jeff & The Fresh Prince and some Run DMC along with some Eminem. Now, THAT'D be fun. In the meantime, I'm going to have content myself with belting out "Take Me On" and "Uptown Girl."