Armin Shimerman is either astoundingly narcissistic or tragically insecure. What other explanation could there be for casting himself in the role of the brilliant, charismatic, incredibly sexy rogue who saves the world from Lex Luther and aliens?
This book is dumb. Really dumb. But the plot exists only as a backdrop for Shimerman to tell us about how wonderful his self-insert protagonist (he even put his own face on the cover picture!) is, how clever and talented and capable and magnificent he is. Not that we ever see much evidence of this, other than his propensity for quickly and decisively winning fights to the death, but we're told repeatedly how impressive he is.
In fact, despite all assertions to the contrary, John Dee doesn't actually seem to be all that bright or particularly good at anything. He only manages to win because he eventually listens to one of his employees and does as she suggests, which he could have done at any time and succeeded a lot sooner. And the only reason he's even in a position to succeed in the first place is because he has some convenient alien technology gifted to him.
Really, the only reason to read this book is a sort of morbid fascination with how Armin Shimerman either sees himself or wishes he could be, and that's probably not enough.