This is the first of a series of stories about the hero with a very special ability to "hop" between universes, the multiverse he comes from, and as ambassador to Earth his and the products of the multiverse he allows to be imported to Earth and their effects on Earth. There is some sex, he has half a dozen women with him from various worlds of the multiverse including a slave world.
His relationships with people of the multiverse and Earth people he recruits to work for him and his embassy are a big part of the story. Another part of the story is the reactions of those earth people he takes to the multiverse to see its attractions and evils. Its a big story, there are intelligent telepathic pets, sugar addiction is a problem for multiverse citizens, and he inherits a major multiverse fortune.
The first twenty chapters just ended the first book with his credentials presented to the UN and the President of the United States of America agreed to recognize him and his staff as diplomats. I am looking forward to more of this story. I don't see how I could give the plot less than ten. There is more going on and twists and turns than in any other two stories.
There are very few technical issues. Any good review should include at least one negative issue to keep my reviewer credentials and mine is the note that starts every chapter about how multiverse measures like weights and currency have been adjusted to our earth basis. I don't see the need to keep repeating the information and it puts me off getting into the multiverse experience with every new chapter. So it only gets a nine.
The appeal to reviewer is good, that's an eight. I suppose the hero not seeming to me to be very human emotionally is a good thing, since he isn't from earth. Try the story, I think you will want to keep reading what happens next.