Welcome to the JavaRanch.
Compared to Struts 1, I found Struts 2 a little more difficult to get up to speed on. It is so much more flexible, I had a hard time nailing down a starting point. Once I got the hang of it, I found Struts 2 to be much more productive. You don't spend all that time writing code for the framework like you do in Struts 1.
What do you want to compare Struts 2 to? Struts 1 or the rest of the framework marketplace?
This guy crunched some numbers that you may find interesting.