It's a big issue that after 2.5 years of development there aren't too many exciting features for Joomla users to move people to switch. Multiple reports of Joomla 1.6 say it's much slower. It sounds like the framework has greatly improved, but that it will not get too many users excited.
No comments is also an issue, as it had been promised (and greatly promoted) to be one of the major Joomla 1.6 improvements.
Joomla 1.6 is now "locked" for new features so there is not much to do about these issues.
My personal opinion: skip 1.6 and go for 1.7.