I know a lot of people have gone through this, but don't feel discouraged to get your music into Rock Band 3. I know the reasonable reasons, like too much work and stuff like that, but if you get some trolls on you, think: "Am I going to let these n00bs get to me?" Of course, there are people who try to help you out to improve, so listen to those people! But there are also people who are complete D*****s. If these people are telling you to stop making music, and your life sucks, and you have no life, that doesn't mean it's true. They aren't your parents.* The only reason you should stop doing what you are doing is if you don't enjoy it. But if you want your music in Rock Band and make money and live life, you have to enjoy it, that's the only reason to keep doing what you love. As long as there are some people who like your music, and you like your music, you are in the right place. This is why I make videos and songs, is because that's what I love.
Now if it's the Harmonix admins, then you better listen to what they say or you're going to get into some big trouble. These are just my words of wisdom. Haters are going to hate, that's all they are going to do.
*Listen to me even if they ARE your parents