Also, please don't judge people who hold parties at Mickey Dees or whereever. Depending on the area you are in, these may be the only indoor venue they can afford, because most of the time they are free or extremely low cost, have ample parking, and are in a somewhat centralized location. Not everyone can afford to rent a community center room or a more upscale venue, not everyone can accomodate people at their house. So I would really caution against stereotyping what the parents are like based on where they hold the party. Because they have it at CEC or McD doesn't mean that they don't give a rip about nutrition--it might just mean that they want to invite all their friends but can't do a house party, and the food/place is within their expense range or they know it will entertain the kids easily, and they're doing the best they can. If it offends your sensibilities to the point where you're going to look down on the hosting parents or families, it's probably kinder to just not go, KWIM?
I agree with all of this completely! It isn't always an issue of money either - sometimes it is convenience (as in my case). Also, even the really expensive places to have parties (Pump it Up as an example) also serves soda and pizza, the same stuff you will get at CEC.