Gamasutra has taken the time to compare the distribution of ESRB rated games for this and last generations' consoles. But, the best part is, they took the time to make some delicious graphs for us.
Some findings in this study are not surprising, such as the fact that the Nintendo consoles (the GBA, DS, GameCube, and Wii) have a significantly smaller percentage of mature games than their competitors. What is interesting, though, is that the Wii (so far) has a smaller percentage of mature games than its predecessor, the GameCube.
The reason we find this of note is because the GameCube was largely regarded as a "kiddie" system by many of its critics, and yet it had a larger distribution of "M" games than the GBA, DS, or Wii. The GameCube was also the least successful (in terms of sales and arguably in other areas, too) of all the consoles in the study.
As a Nintendo gamer, what is your take on the distribution of mature games for the Wii? Is it okay to be so largely outnumbered by games with other ratings, or do you wish Nintendo would find more balance? The small percentage of mature games certainly hasn't hindered the Wii's success so far, but can it alienate the "hardcore" gamers in the future?