I'll give you that. We speak of this in different ways. In games it lags a slight bit. Working with graphics, however, I have no problems with getting it to be accurate.
I think that you have problems with the responsiveness not so much the accuracy. For fast movements it sometimes feels a little slow. This could also be because of the way I have set the acceleration. I should probably have it higher. As far as precision goes in Photoshop, After Effects, and Lightwave it's pixel perfect. Lightwave does feel worse on my Mac than a Windows box, but it is horribly "designed" for the Mac in the first place and running in Rosetta. I'm not sure, but it could also be the difference in dpi between Mac and Windows systems.
By the way, I do retract my previous statement, my wired Mighty Mouse doesn't feel as good as my wired on at work does. I sped up my tracking a bit and it is better though.