What do you like best?
MediaMaths "Brain" and user friendly UI which is easy to navigate makes Mediamath stick out. When I first started out in programmatic, MediaMath T1 was the first DSP I learned. The was the UI is organized in a functional layout that makes sense and also helps understand how the entire landscape in programmatic works. I also value the reporting provided in the UI without having to pull exports and pivot data, makes optimizing campaigns less time consuming.
What do you dislike?
Particular parts of the platform are inconvenient, such as creatives integrations can be nuanced and bring up an array of issues. Some 3rd party tags are accept in T1, and some you have to use an extension. Also newer targeting, such as weather, is managed through another site. Location targeting (such as zip codes can only be verified through downloading exports. The ability to not bulk edit targeting and inventory can be time consuming.
What business problems are you solving with the product? What benefits have you realized?
Working through creatives inefficiencies to create a smoother work flow have gotten better, but are a slower transition as it impacts a huge part of the work flow in T1.
The Brain when used correctly is a nice benefit, but takes time to understand how it fits in to your campaign initiatives and KPIs. The Brain can cut a lot of time out of optimizating and makes in less of a manual process. Although using a platform with that is so automated can be tricky. since you have less control.