5* because: I kept reading all the way through, I laughed (a LOT, and at things that I sometimes felt a bit shocked at myself for laughing at), and I liked some of the parts of the ending a lot. 
 Also, Jorg as a character. Genuinely different from many others. I'd hazard a guess that many other people, like me, hugely enjoyed the road-weary, practical wisdom that Jorg brought to a lot of situations. It somehow seemed to encompass both a 15-year-old's reckless unpredictability AND a mentor's wry lessons, learned over decades. (view spoiler)[I literally just realized as I typed that, that Jorg was also the grizzled mentor character. I like that! (hide spoiler)] 
 In any case, a recommended end to the series!