Some observations going through the thread:
Wow some of you seriously disappoint me. Your inability to look at a situation with anything even resembling logic is almost offensive. If you're going to attack something, think it through. Otherwise you just sound like an ignorant tool. If your argument boils down to "DLC = teh debil", you have absolutely no place in any conversation about DLC since you lack the ability to look at it based on situation and not on general idea alone.
People really still respond to Samus? Really? Just ignore them and save yourself a headache. This thread was another great example of their posts that remain pretty much indistinguishable from trolling.
On the topic of the actual DLC, I have nothing to add that people haven't already said. The idea is that you pick and choose the songs you want. You are not buying $3,000 worth of DLC. You do not need it all to enjoy the game or complete the experience. You may only ever buy 10 songs and be perfectly content. It's your game to make, and it costs all of $2 a song, which people have already explained that whole $1 extra over standard music buying services. Maybe what you get on the disc isn't your cup of tea, but they also can't say "pick any 65 songs and make your own" because they would be eating a lot of cost and potentially seeing zero return from paying to provide this option.
Rock Band is DLC done right. It's completely optional (yes, completely, 100%, you don't have to purchase anything), with lots of options to fit player preference. If you actually have a problem with that, either you have no interest in the game to begin with and simply wanted a hate train to ride, or I can only assume you are completely anti-enjoyment.