I liked that it was easy to create campaigns, set up targets for each campaign etc., although sometimes we did have issues with not being able too track what our ad units were doing if there had been any delay in reporting back from advertisers or other parties involved (ie when people click through).
We used this as part of one-click Adwords but also integrated into some direct channels such ads displayed alongside videos / articles posted by third party publishers/publishers who use us via their own platform rather than going straight onto Google's website - so didn't always work well across all platforms because they weren’t using same technology which could be confusing at times!