Early days it was easy as only few magazines were available like Nintendo Power, EGM, or some computer gaming magazine. I think times were simpler when Gametrailers was the main source, and then after that website dissolved, I don't know what is the equivalent of Gametrailers these days. There's a lot of sources out there, but I don't find them to be on the same level as the ones from the past.
These days I mainly see ign reviews, but I can't say ign is equivalent to what Gametrailers was. ign feels more like CNET (in which I dispise as a tech site with poor reviews). There's Kotaku as well, but it's more of a blog with odd stuff thrown in, so I don't feel it to be the same.
I tend to like Vox media news sources, and Polygon was theirs dedicated for video games, and it seemed to be going in an interesting direction, but not sure if it still is.
These days, there really isn't one source to be the best way to find good media like movies or games. You'd have to dig around the internets and cross-reference to figure things out. Rottentomatoes isn't the most reliable for reviews these days. I look at Metacric for games and movies a well. I cross-reference with different sites.
I always found the original Gametrailers reviewer voice to be the ideal game reviewer voice. I don't know how that happened, but it maybe because it was the main video review site that used the same voice for all the reviews, and it was the first and only voice for reviews I've heard for a long time. that may have make me associate the voice as the proper voice for video game reviews.