To be fair, Nintendo Power was a marketing magazine put out by Nintendo itself, so their ratings basically picked winners and losers in Nintendo's ecosystem, especially in the early days when Nintendo still had enough clout in the game industry that they could make even Sam Walton shake in his shoes by threatening to withhold shipments to Walmart. But NP, to its credit, had lots of game maps and hints, whereas a lot of gaming mags today are a bunch of questionable reviews. :)
Simply put, the video game industry has matured and is now in the hands of suits on both the publishing and journalism sides of the industry. And while Siskel and Ebert were powerful and respected enough that they could afford to piss off Hollywood, game journalism is in a very financially shaky place and the big Western publishers have them by the curly hairs. Ubisoft went on a bitch-fit against 1UP after they were unkind to the first AssCreed. Shoe stood his ground, but Ubisoft blackballing them probably hurt the site quite a bit and contributed to its miseries later on.