Today I've tried installing Drupal 5.16.
It couldn't pass the database settings screen.
The fix applied for Drupal 6 couldn't fix it.
I created a ticket: http://drupal.org/node/407342
We all know that in every software product contains errors. This is *normal*.
I think that a better software product should allow different options for doing one action depening on the different personas.
E.g. experienced linux guru, designer, complete newbie etc.
For example php, MySQL and other offer installers as well as manual installation instructions.
This way bugs in the installer won't prevent people from using the software.
An early bug can easily turn many clients down.