I have yet to find a service as straightforward as Heroku. Cloudfront comes close... but i get the feeling especially when looking at the documentation that Heroku have really put in a lot of effort into making a simple to use application platform.
Don't hesitate to give us feedback - good, bad and ugly. Email openshift@redhat.com or post on the forums and we'll get right on it. Around docs, we're trying to tune the primary landing spot: