[dasil003]

The hallmark of enterprise java is the incidental complexity needed to implement a given abstract architecture due mostly to the strict limitations of the core language. Ruby's more powerful system allows you to implement architectures with an order of magnitude less ceremony (and some would argue safety) and without as much careful planning required to make sure every possible hook is in place up front. In the end, "enterprise ruby" architectures bear so little resemblance to enterprise java that the comparison is nonsensical.

[matdes]

absolutely absolutely this. Patterns don't suck. Implementing patterns in Java sucks. Ruby's got a lot of fantastic things going for it, and duck typing means you don't have all the ceremony of defining and implementing interfaces.