>Has anyone checked our how browser independent ASP.NET generated forms are?

They are pretty independent for me. However, you may want to manually touch up the raw HTML to make sure you're using straight HTML and avoiding those style tags with aboslute positioning in it. That confuses older browsers often.

>Is it just a bad product, or is ASP.NET pretty dependent upon IE?

I wouldn't say its a bad product if it doesn't support other browsers, but it will definitly prevent me from buying it if cross browser support is required for the project you would use it for.