Cleek of Scotland Yard: Detective Stories

If someone could do me the favor of explaining how someone could rate Cleek as less than four stars I'd be grateful.
Cleek needs to be made into a TV show. I am fairly certain people would love it. A period drama, full of mystery. Some parts would be episodic with an over-arcing story line, while other stories would be a season by themselves.
I've seen reviews about this book that say Cleek is racist. Which, yes he does call a Japanese man a "yellow man" and that ... Part product of the time and part that whole conversation is SPOILERS. Also on the subject of that mystery, I want to pull out strong language to yell at Britain, ... I just hope the law has changed.
Some reviews have also mentioned the slang in this book and call me a really show more old British lady, but I didn't notice the slang. I noticed the phrases that need to become quotes yesterday.
"There you have the whole thing in a nutshell, the old lady said as she poisoned the Filberts"
"It’s a murder of a peculiarly cunning and cleverly contrived character, Cleek."
Admittedly Cleek is one of those insufferable characters that seem to know everything there is to know about Upper-Class gossip and the criminal underworld, but he was The Vanishing Cracksman, soooo... show less

Another volume of the stories about Hamilton Cleek, once a brilliant burglar and master of disguise, now a detective working independently but in alliance with Scotland Yard. In this volume e is also revealed to be a prince incognito.