well yes, but it is hard to learn from it. For comparison take a look at this - https://gist.github.com/marktheunissen/2979474 [pedantically_commented_playbook.yml].
NOTE: yes, I did note mpdehaan's comments that this yml is old. However being a beginner in Ansible, I learned a LOT from this.
The OpenShift example is a bit funny - I had asked this on the forums as well. For example the play to shut down a running cluster first attempts to idempotently launch it, causing the appropriate variables to set and then uses it to shut it down. There is another way to do it without doing this. Again, I'm not advocating approach A vs B - I just dont know which is The Right Way and why.
As I said, it is really really hard to learn non-trivial workflows in Ansible. I'm still plowing ahead, but I strongly suspect that is because Ansible has been getting all this support in HN and it is right now the flavor of the month.
Yeah, I don't think everyone shares that opinion, but I do agree we need a better index and a few more examples.
We're always working to improve examples however, and one of the things we're going to be adding is a lot of vertical guides that show some (especially provisioning) workflows from start to finish.
One of the things that is really going to help is the launch of Galaxy in the next few weeks, which is a web site for everybody to share roles, so you will have tons of easy ways to find bonus examples.
https://github.com/ansible/ansible-examples/tree/master/hado...
For a complex EC2 example, here's an openshift deployment ...
https://github.com/ansible/ansible-examples/tree/master/open...