Is Rock Band Too Family Friendly?

Some parents criticize the game Rock Band for encouraging kids to belt out songs with obscene or offensive lyrics. Personally, I don't think kids really have the background knowledge or interest to be as weirded out as they really ought to be by Steven Tyler singing about how he's in heat; and besides, Harmonix really seems to have made an effort to make the lyrics more family-friendly. Since I only ever listen to Broadway musicals, I don't know the lyrics of the originals that well, but I am pretty sure these are altered.

From Radiohead, "Creep"	"What the heck am I doing here?"
From Lit, "My Own Worst Enemy"	"Every now and then I kick the living snot out of me"
From Alice in Chains, "Man in a Box"	"I'm the man in the box, buried in my sugar"
From The Hives, "Main Offender"	"Stuck in ways of being an asp"
From Soundgarden, "Black Hole Sun"	"Times are gone for honest men, and sometimes far too long for snakes"
From Alanis Morisette, "You Oughta Know"	"And are you thinking of me when you pucker?"
From The Who, "Pinball Wizard"	"That differently-abled kid sure plays a mean pinball"
From Nirvana, "In Bloom"	"Nature is a bore"
From Hole, "Celebrity Skin"	"Oh, Cinderella, they aren't nuts like you"
From Deep Purple, "Highway Star"	"I love her; I need her; I saw her"
From Iron Maiden, "Run To The Hills"	"The only good Native Americans are all of them"
From Coheed and Cambria, "Welcome Home"	"You wore some sweet clothing, Rock Band shirts are still cool"
From Alanis Morisette, "You Oughta Know"	"Would she see Xanadu in a theater?"
From Rolling Stones, "Gimme Shelter"	"James Thurber! He's just a shot away"