We[1] haven't found this to be the case. These are early-stage projects but they hold promise for companies that need an internal PaaS at scale. I look at Marathon, Chronos and ZK (to some degree) as building blocks, and DCOS as the glue that will tie them together.
One big reason to use Marathon + Chronos + Mesos is to get multi-tenancy of compute and data workloads on your instances. You can't get that with web-service specific tech like Tutum.
[1] appuri.com