Baseball Prospectus was definitely the highest outlets in ranking Reese McGuire, having him rated as the 59th best prospect in their top 100 list. That might be due to the fact that McGuire is seen as a strong defensive catcher, and BP seems to have a better understanding of the real value of catcher defense.
BP has been releasing their top minor league tools list, and named McGuire as a player considered for the top defensive catcher in the minors. Austin Hedges of the San Diego Padres was named the top defensive catcher, while McGuire was one of four candidates who drew consideration for the spot. The most encouraging thing is that BP said McGuire’s rating was based mostly on projection, and he could propel himself to challenge Hedges for the top spot this time next year.
BP also had McGuire considered for the top makeup in the minors, listed with names like Francisco Lindor (the top option), Albert Almora, and Dylan Bundy. This helps explain why they like him so much, as these lists are based on live scouting reports of all the players.