Reporting services presentation problems

Could anyone help me? I am basing a project in MS SQL Reporting service but I am finding the web pages produced to be very poor in quality. As far as I can see Reporting services is fine as long as all of your users have precisely the same set up as the developer, which is just not the real world.

Obviously the click and drag interface makes the page easy to design, but, the pages very rarely deploy as well as the preview would suggest, not to mentioned issues with users with differing screen res and browsers. The javascript to present pages taylored to the users set up is not problem, but how can I include this in a report generated page? Also I would like to alter other tags for example sizing to 100% instead of to cm or inches.

Is there a way to actual interact with the html (or xhtml) the program produces?