It's quite convenient for those of us who already have the relevant data inside Google Cloud Platform (specifically BigQuery for me). I've made a few dashboard/graph-type things in Google Data Studio and they were super simple to set up and powerful enough for my use case.
I had major problems getting AdWords custom columns working in here which was a deal breaker for me. Too bad since I'd expect AdWords to be fully supported, but then again custom columns aren't really first class citizens in AdWords yet :(
Disclaimer: I work for Google, but not on Cloud.