What type of bugs? Are these bugs with Drupal or plugins? I threw up a quick test site using Drupal and the template functioned as expected using 2.5. And I have no problems with Joomla or WordPress templates. 3.0 has some issues but it's in beta.
We must have been posting at nearly the same time. I experienced a variety of bugs from taxonomy terms not appearing, header line-height issues, template export problems, program crashes, navigation menu not functioning, to mention a few.
My sites are pretty basic in structure and don't make use of many modules (no CCK, no Panels, etc.) so I can't speak to module incompatibilities.
In short, I found that the program did not do what is was designed to do. It would require tweaking the code, for example, to make taxonomy terms appear or adjust header line-height, etc. Things the program was designed to do so you didn't have to mess with the code.