I have just reviewed the new Latin edition of Diary of a Wimpy Kid, "Commentarii De Inepto Puero", which is intermediate-ish (i.e. I need my dictionary and my grammar text at hand to check on things at intervals) and it does not have macrons either :-(

http://thegardenwindow.blogspot.co.uk/2015/09/the-diary-of-wimpy-kid-latin-edition.html (http://thegardenwindow.blogspot.co.uk/2015/09/the-diary-of-wimpy-kid-latin-edition.html)