I've been running Marathon in production (real production) to power more than 100 applications for the past six months. I chose it because it seemed like the most stable thing at the time; however, quickly found it was not production ready. While many of the original issues I encountered in 0.7.x were resolved with the 0.8.x release, 0.8.x brought new issues such as stuck deployments, etc. Additionally, I have found the upgrade path to be obtrusive and frankly scary. I am actively moving away from Marathon because of these issues.

Marathon does not make using Docker or building microservices simple. There are many important pieces that Marathon does not provide. Sure your operations team can tie in Mesos-DNS / Bamboo / Consul / whatever else, but it's going to take time, requires a specialized team, and leaves you feeling nervous about what happens if everything crashes in the middle of the night. Even when tying in these third party tools, it is likely you will have to make significant code updates to utilize features such as service-discovery / SRV records. You will inevitably end up with a hobbled-together system that needs serious support from your operations team.

I am fairly frustrated as a whole with Mesosphere, and expected more from a company who raised so much capital.