Hi there, Marathon committer here. If you had a bad experience with the 0.7.x series, I apologize for that. We've made a serious effort to fix the consistency issues and that work has paid off. 0.8.0 is current, and we've just tagged 0.8.1-RC1 yesterday. I encourage you to give it another try! As mentioned in the other comments, we (Mesosphere) are actively working to provide alternatives to zookeeper such as etcd. The reality is that ZK will stick around as a stable option for people, as the first > 1.0 etcd release was tagged only two months ago.
The DockerInfo protobuf has been updated to let frameworks pass arbitrary options to `docker run` via the Docker containerizer. This will come in handy for specialized use cases (--volumes-from, --lxc-conf, etc.)