It's possible to write bad code with any tool, and ASP.NET is no exception. This is a popular site, written in ASP.NET by my company: http://twibbon.com/ Is that bloated?
I agree. No, that code isn't bloated. I think the problem may lie with using a framework (badly) rather than with ASP.NET specifically. I had just noticed with other ASP.NET powered sites, that the CSS class names were all unnecessarily long, which does add up to quite a lot of bloat, especially on larger pages.