I must simply say I like MooTools because of what it is. It fits my way
of thinking better then any other framework I have tried.
I find I like the community it has created full of helpful and friendly
people, and not a collection of "how I make Blinky Linky?" users.
I prefer this because I can learn here, not get a quick download this
plug-in and add this line bit. Where I will learn nothing.
MooTools is about learning and creating not about user counts or eye candy
:)
At least that is my biased view of it all :D