Actually HnG's fanservice is always rather been excellent(opinions,lol). It's not too much, yet it covers pretty much all major and hidden fetishes. And it never gets to the level where it sickening me with its fanservice.
It should be a really good series if the pace, the jokes and the plot are delivered smoothly, but it sure is lacking in those department. Maybe it should be a more 'wild' series if it wasn't aimed at the children as main target audience.
But then I remember about Gintama....