You do have a point there. No doubt about it.
I should have written my comment differently. While yes, I do agree Messages has issues and launched prematurely (and hasn't been updated enough to fix all those issues), Adium has been out for many years and so many problems I've been having with it have never been addressed.
So - while yes, Messages is buggy, I'd say no Adium is not a more stable and productive replacement for it (in my humble opinion).