Well, I haven't used WW2 since the fall of 2006, and I've never used Spring MVC.

When I started Quadran, my last big Java project, I reviewed the offerings at the time:

• Struts 1: Not interested.
• Struts 2: Ultimately went with this. I liked OGNL, it's support for type conversions and rich models, and the interceptor stacks are nice.
• Spring MVC: I didn't care for it, and if I remember it lacked type conversions to fill in rich models. (I'm not sure if that is true anymore though.)
• JSF: Not for me and everything a POST didn't work for us, and I really didn't want to have to work around my framework.
• Tapestry: Too far out of the mainstream for me. I got it, but felt it would be more difficult to staff a team.

Now today, I'm not sure I'd use any of the above and would take a long hard look at Rails and Grails. If you need Java integration look at Grails. If you don't need Java integration look at Rails.

Mark