I'm obviously biased.
Most of Cloud Foundry is built the way I like software to be built. Pair programming, TDD, small balanced teams, prioritising for user valu.
That style of development is actually baked into the Cloud Foundry Foundation rules. Companies who join the Foundation are expected to send engineers to ramp up on developing in this style. And voting rights are based on the number of full-time engineers you have assigned to the effort.
The reason I mention all this is that I trust the way we build Cloud Foundry. We still get production bugs and oversights and mistakes. It's around 4 million lines of code that turns into a distributed system of ~50 different interacting processes. We built a fully-featured, robust PaaS, using containers, in about 3 years, starting from scratch.
Nobody outside Google had built a container platform of this level before. Nobody but Heroku had built a fully-featured PaaS of this level before. We are, to my knowledge, the first system to do both of these things. Certainly the first opensource one.
The reason you never hear about Cloud Foundry is because we've already built all the components other folks are trying to roll up into full PaaSes. "It just works, already" is a boring story.
But again, quite seriously: I am obviously very biased.