I think some people need to get a sense of perspective about this: MobileMe is a service designed to make life a little more convenient and it mostly achieves this with a single exception that will no doubt be addressed at a future date. If you don't like the service, don't use it!
We live in a world where millions of people sleep rough every night because they can't afford housing, where millions are denied access to proper healthcare and even clean water, where people are killed in wars that rage around the planet and people are up in arms about a minor flaw in a piece of software. Sad, really...
All those things are important.
But Apple isn't a housing, water, health, food company or peace force.
It's a Computing Company. It should be able to serve its customer's needs.
If my local water company wants to try push Calendar, they're more than welcome.