If I could award this game 4.5 stars, I would. It is a staggeringly well designed, thoroughly thought out and superbly executed game. That said, it's not one that I take off the shelf all that often.
There is very little luck in Puerto Rico and because of that there are cetrainly 'best' plays to make in any given situation. The more you play the better you get at discerning the best option to take, and that's where the problem lies for me. I would hesitate to label this a family game and I certainly wouldn't like to play with anyone under 12 years old as seating order and skewed player ability can have a huge effect on the outcome. Playing this game with those that have a played a lot before can be a dispiriting experience and it would appeal to those who want to strive to play it as best as they can. I know some who level the criticism that it is 'recreational accountancy' and whilst I can see why it would be considered dry, that is still a bit harsh.
To give it five stars would be to suggest this is a perfect game and it isn't. Although with four or five well matched players around the board, it certainly gets very close.