I like that it's easy to use, simple interface and fast execution of campaigns in order for us as marketers or advertisers do not have much time to waste! It needs more features such as targeting by country/region etc.
Also we need some other types of filters (such as device type), which can be used together with region filter so you don't always get all your traffic from one place. We are solving our problem of getting leads through adsense without having too many people clicking them just because they want free content - this tool helps solve those problems.