“When it comes to software, the 360's launch has been heralded by some as the "best launch ever" and by others as a total bore, with no compelling reasons to get the system. I did a little research.
I went to www.gamerankings.com and got the average review score for every launch title for the last several major home consoles.”
Jason Cross's 1UP Blog: Best Launch Ever? Worst? (via Major Nelson)
Interesting, though it doesn't take into account the Marketplace and Arcade titles. Though by the way he judges that would be a bit difficult.