wow I'm actually surprised by this thread, which reminds me that I shouldn't be anymore... anyway, I personally love the new Exposé, for me it's the best new "visible" feature in SL. The only thing I don't like the the ugly blue outline, but other than that I couldn't be happier.
The whole scalable discussion I can understand from some perspective, but for me it's perfect like it is now. I have dual 24" monitors, one horizontal, one vertical, and I use 6 spaces meaning that when I activate spaces to have a look to see them all at the same time (to easily move around apps and windows) most windows are just a few pixels each unless they are full sized apps. Now with this new Exposé even those tiny little windows can easily be found and moved around between spaces.
So far I haven't had much use for the new dock-activated-Exposé, mainly because I don't use the dock that much, but from my short experience this new Exposé is a huge improvement.