It is a very well written opinion piece that gives his ( valid ) reasons for not using play any more. That being said he doesn't say anything bad about the framework or the idealogy behind it and in fact laments having to move away from its ease of use.

He does bring up the point that Play 1.X is essentially out to pasture at this point. Thats not to say typesafe can't come back and once 2.0 is settled and fix the outstanding bugs , but as far as the community is concerned most have moved on to 2.0 or are aren't experiencing these issues.

For my part I have never ran into any serious bugs on my Play apps and services. I would note that I don't have any very large scale deployment, mostly just internal applications. I am however using Play 2.0 as the foundation for my next big project and so far even the RC have proven stable and functional.

Sounds like the author doesn't understand concurrency or how to set up the unit tests from an IDE with a version of play framework which is only weeks away from being completely replaced.