It really shouldn't be a surprise to anyone that a central-server-reliant game has server issues on launch day. Some are unbearably bad weeks later, some are fine within a day or two, but it's ALWAYS a problem.
For the review score? Either Polygon should have just left the score as-is (like they did with Diablo) unless it showed itself to be a persistent problem, knocked it down to a 4 ("fails at basic functionality") until the servers start working properly, or held off on a review altogether until the server situation had stabilized.
Of those three, frankly, I'd say the first would've been the right choice. While Polygon can dynamically update review scores, there's a difference between "this game experience has changed substantially from what we reviewed" and "brief service outage/bug in patch that's corrected within 24 hours," and it's unreasonable to expect a reviews staff to monitor every game they've reviewed for those kinds of problems. And more influential individuals than I have gone on at length about why "wait for retail code," while noble, isn't a logistically or economically viable route for a website to take.
Game journalism needs to do a better job of differentiating product reviews and experience reviews. It's only going to get worse going forward.