The "tall tippy tower" of Stacks is pretty silly. I could buy into the ergonomic concept of following the sweep of your mouse hand to some extent - until someone remined me not everyone is right-handed. In reality, it's visually jarring, because it's SUPPOSED to be - something to catch your attention in the store and make Leopard stand out. Once you start using it every day, the novelty wears off in a few minutes and it's just an eyesore; supporting my feeling all these effects are designed to SELL, not to use.
Of course for me, I don't HAVE any folders with a dozen or less items, so Stacks is useless. And so at this point, folders in the Dock are useless, as we've lost the previous behaviour.