First of all I love the fact that DBM is the only DSP allowing advertisers to take part in Youtube inventory. The inteface is beautiful, fast and intuintive. Support is quick and always friendly, which is definetly one of the most important things from a client perspective.
Same as I love that this is the only platform allowing acces to YT inventory, I also dislike tha G is making it restricted for other platforms to compete in the same market.
I can't think of anything else I dislike from DBM. After having worked with more than 3 different DSP I can only say that DBM is the best.
Spend some time reading all the wiki directory that Google has created. By doing this you will fully understand and embrace all the power and possibilities of this platform.
They really took good care of creating a wiki easy to access, read and explore.
If you have previously used other DSP, you won´t find big differences when you start using it. The interface is really intuitive and despite each DSP calls the campaign structure differently, you will quickly learn how to use it.
We got prio access to youtube inventory and have the option to run programmatic campaigns in this platform. Thanks to DBM we can accesss the inventory of the main ad exchanges fro display, video and native. The fees are not low but it is totally worth it.