It actually surprises me that so many people are agreeing with this.
First, I will make it clear that I do believe that it's possible to make a good casual game. However, the large majority of casual games are absolute garbage. "But" you protest, "the majority of hardcore games are absolute garbage, too!"
Exactly right.
The difference is that hardcore crap fails, and casual crap doesn't necessarily. Has any terrible hardcore game enjoyed the success of Carnival Games? Please, nobody answer that question with "Modern Warfare 2", because as much as some people hate it, it is at least liked by the majority of people and the gaming media.
I should make it clear as well that I hate on every company who does this in equal measure. Microsoft, Nintendo, Sony, EA, Ubisoft, Activision, whoever it may be. There is nothing wrong with making a good game aimed at casual audiences. There is, however, something deeply wrong with making crap aimed at casual audiences.
So, the reasons I dislike bad casual games:
1) They divert resources away from good games
2) They often end up selling disproportionately well
3) The company is fully aware that they are terrible and releases them anyway.
I don't think Sesame Street is going to be like that. I do think Disneyland Adventures is going to be like that.
(Former) Lead Moderator and (Eternal) VGC Detective 
