Woah woah woah there is a clear difference between this and other forms of microtransations.
Rockband DLC is just songs. Added over the course of years and years. And it's for the previous games. They didn't think "Before we make Rockband 4 let's make 3 grand word of DLC" It's added over a long period of time and people download the songs they like or want to play at their own discretion. It's only going to get 'worse' there will be no new Rockband games, they're just going to keep adding songs. It's not like missions, where you're missing out massively if you don't download it. If you get bored of your songs after a year you can download more that you like.
I think rhythm games like Rock Band and Guitar Hero are the only games where Microtransactions are far better than just spending 60$ on ANOTHER game when all they really did is touch some visuals and add new songs.
There's only 2 races: White and 'Political Agenda'
2 Genders: Male and 'Political Agenda'
2 Hairstyles for female characters: Long and 'Political Agenda'
2 Sexualities: Straight and 'Political Agenda'