damiende,
While I may say your frustration is apparent, you seem to be misplacing it. What you want is a simple "upload and go" gallery, complete with options to plug-in and fine-tune how you wish. As evidenced by your desire for Facebook and AdSense.
The simple problem here though is you want it without effort. There are plenty of people who dedicate hours upon hours of their life to help make Zenphoto a better solution.
I would also venture a guess you probably know little about php or html. If you did, you would see that the Zenphoto system is about as easy a gallery, and a flexible, that you'd ever need.
Is it for the nerds? No, it's for those that like to help themselves. Is it for the masses? Sure, but as you said, without effort on their own part, they have to be content with the options that are given to them.
All you need is effort, either your own or someone who you've hired to do the work for you. Without that, you're left with what people share for free. Don't like it? Put forth a little effort.
Edit:
And per the AdSense bit.. there is no simple answer to where to add the code to your page. Because, quite simply, each gallery has different things active. On top of that, where one person may want it on a page doesn't work for where someone else may want it.
Again, effort.