Considering the downloadable content comes promptly every week, Rock Band songs will eat a normal Xbox 360 hard drive within a matter of weeks. With Nintendo's stubborn refusal to add ANY hard drive for the Wii, it's unrealistic to expect the same level of downloadable content.
We can go on about Wii owners getting the shaft. As far as Guitar Hero 3 goes, no downloadable content was the least of their problems. It wasn't even in STEREO! I think Wii owners will just be happy to get anything at this point.
Similar to what I said in the Wii U thread, I'll still be including DS releases in these threads. I just arbitrarily picked now as a good time to shorten up the titles. 3DS Retail (Tuesday) • nothing DS Retail (Tuesday)