i dont mind that they wussed out honestly. I'd rather have it the way it is, then have it hyped up as a version with vocals only to get that taken away somehow due to legality issues.
Besides, how many of these people do you really think will be able to hold a tune? i don't want a tone deaf singer hurting my ears no matter how good the rest of the track he made is. This is why i dont listen to Coheed & Cambria :-D
Besides, its not like you cant yourself sing along to a track you made when playing it with friends, really you're only limited to uploading your vocals and sharing them, which would be odd anyway considering you'd have no idea what the vocals are going in, where as you're probably well familiar with lyrics in the songs already on the disc.
On top of that, imagine going in to GH-Tunes and downloading a track, and the lyrics spew out a bunch of hate speech like gay bashing or curse words? With all the potential users, thats way too much to expect activision to monitor.
ps. preordered my copy today. i plan on putting about $20 towards it every week until launch, so it doesnt seem like that much when he gives my my total due.