An excellent show like Miami Vice has plenty of ways for newcomers to discover its unique blend of entertainment, smart drama, high production values, and the best side of 80s style. So I'm surprised that this of all episodes currently holds such a top rating on IMDb. I'd advise newcomers to start with a different one, lest you get the wrong impression.
"Definitely Miami" jams two plots into the same hour. Either one had the potential to be excellent in its own episode, but since they're compressed into less time here, they both get short shrift.
The sluggish direction falls short of Vice's high standards, and features a rough opening scene for the heroes. While sitting poolside at some sort of country club, waiting for a contact from the underworld, an undercover Sonny ogles a stranger. Yeah, Sonny has an eye for the ladies, but his blatant lechery here is out of character, over-the-top; and the direction matches it, capped off by what may be the goofiest shot of Don Johnson in the entire series. The seconds drag on as the camera pans over the woman's body, and a grinning Sonny stares and stares.
The woman he's ogling, Callie Basset, is another weak link. The character is supposed to be Sonny's vulnerable, yet mysterious and perhaps untrustworthy object of affection. Vice is known for its star-studded guest casts and their strong acting, but the model playing Callie doesn't impress, and she fails to bring depth to the role.
The episode's 2nd main guest actor does better. Best known for playing Phillips, chief of the boat in Apocalypse Now, Albert Hall cuts a dash as a pushy federal agent trying to convince a mobster to testify. His final scene with Castillo is very well-directed, unlike most of the episode.
I would direct newcomers towards a different episode instead. There are so many to choose from, and I haven't even finished the series yet, but perhaps "Knock, Knock... Who's There?", "Fruit of the Poison Tree", or "Child's Play". I haven't seen "Brother's Keeper," the double-length pilot, for a while, but that one might be a good general introduction.
