Agreed. I'm relatively new to Drupal and the first thing I did was try Drupal 6 beta 3. I ran into numerous bugs and quirks right away. I can see some very nice features to it, but it seems like it has a ways to go before it's ready for mainstream.

Drupal 5.5 on the other hand seems rock solid, though it doesn't seem as streamlined nor does it have all of the out-of-the-box features (like OpenID, although it can be relatively easy to add).