I found it interesting how many of the reviews dismissed Darin as a has been (he actually had a successful TV show and was set to open the MGM Grand in Las Vegas at the time of his death), yet, here all those reviewers are at a show, one of two in ten years, not to mention a film 20 years ago, plus a number of books (the one by his son Dodd being the best) about him. Even Sinatra and Dean Martin can't claim that. I would be willing to bet there will be no such honoraria for Jonathan Groff 50 years from now.
The reviews revealed what sounds like the writers left out a lot - I understand that much had to be eliminated/streamlined. For example, while he and Dee were divorced, they remained close, particularly after he found out about her childhood abuse and her therapy. They were actually working on reconciling before he died. Also, the fact that he adored his son - probably his best relationship. There actually could have been some sort of happy ending instead of leaving it with the idea of him being unfilled and forgotten. He may have, in fact, deliberately brought about his death. Leaving when everything was on a positive note. Because of his rheumatic heart disease, before having dental work, he was supposed to take antibiotics. For his last appointment, he didn't take them, nor did he take his heart medication (according to Dodd's book). Not taking the medication caused him to develop a sepsis infection that went to his heart. Darin was a smart man, and he had to know this would happen. The heart surgery he had a couple of years earlier which had been successful had been destroyed. A complicated man.
That said, it does sound like Groff puts on a great show and deserves the plaudits he receives, I'm just sad that the show was lacking in the book.