I like ActionScript 3.0, but I find it weird for you to ask it just like that. Why do you want to know what we think about AS 3 ?
No idea, it's very difficult and confusing... I found no difficulty with AS 2.0 but with As3.0 every thing seems difficult...
I find AS 3 simple when it comes to programing it in Flex Builder. As for flash, I have no idea how to code anything in it. AS 3 is made easy if you watch the tutorials offered from Lynda.com. They are really good at teaching, in my opinion. I learned from the Flex Training Course. There is a Flash Training Course as well.
Meh, its basically Javascript. Easy, decent enough language. I dislike that Flash crap though, so ActionScript is pointless to me.