Some may complain about Moore's racist political views expressed here, or that he constantly teases about what he did during the war while refusing to reveal the details. Also you obviously only get his side of events, and some have claimed his professed modesty is not genuine. But I think the book succeeds in showing exactly what he considered important in his life. It's easy to forget he was the product of an earlier age. He doesn't talk about his emotions in the way a modern celebrity would because he was raised with the stiff upper lip of Victorian Empire. But he is clear about the people, pastimes and causes he cares about. So as an autobiography I think it is pretty good.
A deeper question raised is whether Moore himself was a good man. It's something of an artificial distinction. Real people can't be divided neatly into good and bad: they are what they are, and provided they aren't asking us to vote for them or committing crimes I'm not sure we have a right to judge them. (Especially in cases like this when the judgement is on whether a man's *views* are acceptable, not his actions.) But overall I am still fond of him warts and all.
He wasn't very notable as an astronomer, but his passion for the subject enabled him to present hundreds of TV shows and write hundreds of books. He did a lot to popularise science. If a budding astronomer wrote him a letter, looked up his phone number and called, or even turned up at his door step and asked to look through his telescope he did everything he could to encourage them.
He did suffer from believing the Daily Mail propaganda, whereby fear of the other engenders a mindset of persecution. Given both the personal losses inflicted on him by foreigners in his youth (his fiancee, his knee, all his teeth) and the mass immigration of foreigners into his home country he witnessed in his old age I find this flaw forgivable. He was no little Englander: he travelled all over the world and there is no indication that he practised discrimination against any of his international collaborators. Thus his 'crimes' are really thoughtcrimes.
True he admits to being a lifelong Tory voter, but he was an honest Tory. I would trust his motivations to be far more selfless than any of the snivelling liars from any branch of the current LibLabCon party. (I think he would feel the same about them as I do - one of the few politicians he credits in the book as having any decency is Tony Benn.) Maybe being born into the upper class prevented him from really understanding the struggles of those less privileged, but he didn't actively hate them or try to kill them like Cameron and Osborne are doing.
Also in the plus column: he loved cats, campaigned against fox hunting, despised government and when his friends died he adopted their children. And being the GamesMaster must count for something.