I find it hard to imagine that there is any web framework still around that could be more screwed up than Struts. After having had some major exposure to the various members of the Struts family and Rails, I would say that the experience of using Struts 2 is slightly worse than using Rails while being flogged by an expert torturer. :-)

If you want to test the world beyond MS I would recommend (apart from Rails or Django) looking into the Scala/Lift (my preferred toolset), Clojure/Compojure or JavaScript/Node.js combos (depending upon you language preferences).

I would be careful with Rails, when you plan to do some heavy data processing and/or if you need your application processes to run for a long time without being restarted.

For small, straightforward applications or prototyping the Ruby/Sinatra/MongoDB combo is also really really nice.