Interesting article on how Rails features can be more of a hindrance than a help in many situations. Compared here with Django, which can be cleaner and more lightweight.
Some of the bits and pieces that come bundled with Rails are just plain wrong, the Javascript helpers being one example. The abuse of HTTP by default in some of the scaffolding code being another. Oh, and the markup coming out of various helpers as well. In trying to help the application developer Rails gets in the way of the professional webstandards types.
Morethanseven » Why the webstandards world appears to be choosing Django