New to postgresql - Do I have to be a "superuser" to be able to create a database?

Hello all. I am more accustomed in doing things the Oracle way and I am
trying to get a hold postgres :)

Below are my roles/users and their attributes.  Posgresql version: 9.2

   Role name     |            Attributes
| Member of
---------------+-------------------------------------------------------------------------------+----------------
 devs                | Create DB, Cannot login
|   {}
 batman            |
|   {devs}
 postgres          | Superuser, Create role, Create DB, Replication   |
{}


As you can see:
role:  DEVS is configured to be able to create a database.
user: batman is member of DEVS

However, when I login as batman and I issue the command "CREATE DATABASE
metropolis;"  I get a Permission denied. Even when I give DEVS a "superuser"
attribute, user batman still cannot create a database. Do I have to elevate
user batman to a superuser? Isn't that dangerous when it comes to security?

Thank you :)



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