Does Rock Band 2's additional songs rock-eth?

If you registered Rock Band 2 to receive an additional 20 free tracks to download, you may become slightly disappointed with the playlist. These songs are from lesser known bands - perhaps underground sounds. Is the free content worth the approximate 500mb download? You tell us! Here's the track-listing provided by 1UP:

"Sons and Daughters" by The 88
"No Regrets" by Authority Zero
"Prequel To The Sequel" by Between the Buried and Me
"Bounce" by The Cab
"Get It On" by The Chevelles
"Give It To Me" by The Cocktail Slippers
"Database Corrupted" by Dealership
"I Wanna Be Your Man" by Endeverafter
"Ashes To Fire" by The Ghost Hounds
"Young" by Hollywood Undead
"The Feeling" by Kutless
"If I Ain't Got You" by The Len Price 3
"I'm Gone, I'm Going" by Lesley Roy
"Burn You Down" by Opiate for the Masses
"Magnetic Baby" by Semi-Precious Weapons
"Like a Fool" by Shaimus
"Crazy Tuesday" by Thenewno2
"The Time Is Wrong" by Tickle Me Pink
"Desperate Times, Desperate Measures" by Underoath
"I.V." by X Japan

Even though most of these bands are unrecognizable, they are established. Check out these artists in iTunes Music Store for a 30 second preview. These punk to rock songs are available now to registered owners as they should have received a redeemable code in email today. Meanwhile, Wii owners will have to wait until December 16 when Rock Band 2 ships.